kb of nh4+

nh3nh3? Nba 2k20 Player Tracker, Your email address will not be published. On exposure to air it gradually assumes a yellow color because of the oxidation of traces of bromide (Br) to bromine (Br2). The ion is the by-product of a chemical reaction between a proton donor and Ammonia, which is as follows: Lewis Structure is a simplified arrangement and presentation of the electrons present in the valence shell of a molecule. Ammonium bromide can be prepared by the direct action of hydrogen bromide on ammonia. 2022 0 obj<>stream What is the Ka K a of N H+ 4 N H 4 +, its conjugate acid? than NH4+ is an acid. Nitrogens valence electron count, however, is 5, owing to its position in the 5th group of the periodic table. Check questions. National Institutes of Health. <]>> This system acts as a buffer because the ammonia reacts with acid and the ammonium ion reacts with base:. Nitrogen, having 5 valence shell electrons, along with 4 from Hydrogen, should have had 9 electrons. Ammonium bromide, NH4Br, is the ammonium salt of hydrobromic acid. than CN is a base. . NH4+ has 4 hydrogen atoms, therefore, there are 4 hydrogen electrons. \[\ce{CO3^{2-}(aq) + H2O(l) <=> HCO3^{-}(aq) + OH^{-}(aq)}\], \[\ce{HCO3^{-}(aq) + H2O(l) <=> H2CO3(aq) + OH^{-}(aq) }\]. The Kb of CN- is 2 x 10-5. Save my name, email, and website in this browser for the next time I comment. Determine the identity of the corresponding Brnsted base by removing a proton from the formula to get \text{CH}_3\text{NH}_2 (methylamine). Kb = {[NH4^+][OH^-]} / [NH3] According to the above balanced equation, the molar concentrations of ammoniuim and hydroxide ions are the same. To identify the corresponding Brnsted acid, add a proton to the formula to get \text{CH}_3\text{COOH} (acetic acid). Solving Equation 16.8 separately for K_a and K_b gives, respectively, K_a = \frac{K_w}{K_b} and K_b = \frac{K_w}{K_a}, (a) Conjugate base \text{CH}_3\text{COO}^: K_b = \frac{1.0 10^{14}}{1.8 10^{5}} = 5.6 10^{10}, (b) Conjugate acid \text{CH}_3\text{NH}_3^+: K_a = \frac{1.0 10^{14}}{4.4 10^{4}} = 2.3 10^{11}, (c) Conjugate base \text{F}^: K_b = \frac{1.0 10^{14}}{7.1 10^{4}} = 1.4 10^{11}, (d) Conjugate acid \text{NH}_4^+: K_a = \frac{1.0 10^{14}}{1.8 10^{5}} = 5.6 10^{10}, \text{CH}_3\text{COO}^: K_b = \frac{1.0 10^{14}}{1.8 10^{5}} = 5.6 10^{10}, \text{CH}_3\text{NH}_3^+: K_a = \frac{1.0 10^{14}}{4.4 10^{4}} = 2.3 10^{11}, \text{F}^: K_b = \frac{1.0 10^{14}}{7.1 10^{4}} = 1.4 10^{11}, \text{NH}_4^+: K_a = \frac{1.0 10^{14}}{1.8 10^{5}} = 5.6 10^{10}. The ppt is Cu(OH)₂. For Arabic Users, find a teacher/tutor in your City or country in the Middle East. These hybrid orbitals, formed by the hybridization of an atom, are helpful in the explanation and understanding of an atoms molecular geometry, its atomic bond properties, and the position in the atomic space. Consider the following reaction in aqueous solution: H2O + NH3 NH4+ + OH- Identify each compound in this reaction (considering both forward and reverse reactions) as either a Bronsted acid or base. 5.6 x 10-10. This page titled Carbonate Ion (CO) is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by James P. Birk. The end goal is to identify a configuration with the best electron arrangement such that the formal charges and the octet rule are upheld. How do you declare a global variable in Java? . Which Of The Following Is A Form Of Political Participation, Kb = [NH4+][OH-] / [NH4OH] Since the ammonia solution fully dissociates into equal amounts of [NH4+] & [OH-] ions we can substitute . Hit enter to search or ESC to close. HJ 812-2016 Li+ Na+NH4+K+Ca2+Mg2+ . . (c) \text{F}^ is the conjugate base of \text{HF; Ka} = 7.1 10^{4}. In strongly acidic solution, \(\ce{CO2}\) gas is evolved. Problem: If you know Kb for ammonia, NH3, you can calculate the equilibrium constant, Ka, for this reaction by the equation: NH4 + NH3 + H + a) Ka = KwKb b) Ka = Kw / Kb c) Ka = 1 / Kb d) Ka = Kb / Kw Use the conjugate acid from the equation. Keeping Nitrogen in the center, and considering Hydrogens position on the outside, we can place the 4 hydrogen atoms surrounding the single nitrogen atom. As mentioned earlier, NH4+ is made up of Nitrogen and Hydrogen. 2. Carbonate ion, a moderately strong base, undergoes considerable hydrolysis in aqueous solution. Hybridization provides the NH4+ atom stability, therefore giving it numerous advantageous uses. : :NH3NH4+,NH3+H+=N. 2) Copyright 2018 RJFP. Which Of The Following Is A Form Of Political Participation, Creative Commons Attribution-NonCommercial 3.0 Unported License. [2], Except where otherwise noted, data are given for materials in their, https://en.wikipedia.org/w/index.php?title=Ammonium_bromide&oldid=1107010044, This page was last edited on 27 August 2022, at 17:09. Most common types of hybridizations are sp, sp2, sp3, sp3d, sp3d2, sp3d3 etc. 0000012605 00000 n (a) A K_b K b value is requested, indicating that the acetate ion is a conjugate base. The ppt is Cu(OH)₂. The PH Of A Salt Solution Of NH4CN Would Be: Greater Than 7 Because CN Is A Stronger Base Than NH4+ Is An Acid Less Than 7 Because CN Is A Stronger Base Than NH4 Let's see if I got the equation correct: NH4+ + H2O NH3 + H3O+ because ammonium chloride is a salt of a strong acid and weak base. What is the setting in the book A dogs Purpose? As a result, all four electrons contained in the atomic orbitals in the outermost shell of the nitrogen atom can participate in hybridization, making it SP3. Answer (1 of 2): [H+]^2 * Kb = Kwater * [NH4Cl] [H+]^2 * 1.8 x 10^-5 = 10^-14 * 0.35 [H+]^2 = 1.9410^-10 [H+] = 1.3910^-5 M pH = -log[H+] pH = 5-log1.39 pH = 4.86 We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Choose an expert and meet online. 1. - :NH3NH4+,"=+,,". The pH of a salt solution of PUGVIEW FETCH ERROR: 403 Forbidden National Center for Biotechnology Information 8600 Rockville Pike, Bethesda, MD, 20894 USA Contact Policies FOIA HHS Vulnerability Disclosure National Library of Medicine National Institutes of Health It is an acid salt because the ammonium ion hydrolyzes slightly in water. K a K a and K b K b Relationship: Given the acid dissociation constant of a weak acid, Ka K a, the base dissociation constant of its. the initial concentration of ammonium chloride will be .1, and 0 for both NH2 and H3O+. { "Carbonate_Ion_(CO\u2083\u00b2\u207b)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "Halide_Ions_(Cl\u207b,_Br\u207b,_I\u207b)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "Phosphate_Ion_(PO\u2084\u00b3\u207b)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "Sulfate_Ion_(SO\u2084\u00b2\u207b)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "Sulfide_Ion_(S\u00b2\u207b)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "Sulfite_Ion_(SO\u2083\u00b2\u207b)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, { Characteristic_Reactions_of_Select_Metal_Ions : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Confirmatory_Tests : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Properties_of_Select_Nonmetal_Ions : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Semimicro_Analytical_Techniques : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Separations_with_Thioacetamide : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, [ "article:topic", "Carbonate", "authorname:jbirk", "carbonate ion", "showtoc:no", "license:ccbyncsa", "licenseversion:40" ], https://chem.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fchem.libretexts.org%2FBookshelves%2FAnalytical_Chemistry%2FSupplemental_Modules_(Analytical_Chemistry)%2FQualitative_Analysis%2FProperties_of_Select_Nonmetal_Ions%2FCarbonate_Ion_(CO%25E2%2582%2583%25C2%25B2%25E2%2581%25BB), \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\), status page at https://status.libretexts.org. Get a free answer to a quick problem. 0000014794 00000 n THANK YOU! The pH of a salt solution of NH4CN would be: Greater than 7 because CN is a stronger base than NH4+ is an acid Less than 7 because CN is a xref 2020 22 Making educational experiences better for everyone. Acid with values less than one are considered weak. NH4+ is our conjugate acid. The problem is that the products ( Cu(NH3)4 and SO4) should be soluble, no? Fastest 17 Hmr Ammo, NH4CN would be: 2003-2023 Chegg Inc. All rights reserved. The Kb of CN is 2 105. (b) A K_a value is requested, indicating that the methylammonium ion is a conjugate acid. 2020 0 obj <> endobj 0000006099 00000 n Im a mother of two crazy kids and a science lover with a passion for sharing the wonders of our universe. The NH4+ ion has no pi bonds. (Kb > 1, pKb < 1). answered 03/31/21, Ph.D. University Professor with 10+ years Tutoring Experience. The solution is therefore acidic - it Has pH < 7.00 . I have no idea what NaC2 is.I suspect you were trying to write NaC2H3O2. Required fields are marked *, This journal is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. The Ka of NH4+ is 5.6 1010. The concentration of water is absorbed into the value of K b; K b provides a measure of the equilibrium position (i) if K b is large, the products of the dissociation reaction are favoured (ii) if K b is small, undissociated base is favoured.. K b provides a measure of the strength of a base (i) if K b is large, the base is largely dissociated so the base is strong In order to understand this properly , let us do a practical example: What is the pH of a 0.43M solution of NH4Cl? Compare this value with the one calculated from your measured pH value (higher, lower, or the same). Ammonium bromide is a weak acid with a pKa of ~5 in water. Solubility. NH4Cl is the salt of a strong acid (HCl) and a weak base ( NH3) . In the Lewis Structure, electrons are depicted as dots. During hybridization, the orbitals having similar energy can mix. There is no such animal as NH4 as a neutral material. NH3 + CuSO4 -> NH3 adds a hydrogen ion (from HCl or another source of H^+) to become NH4^+. Another way of identifying the hybridization of an atom is by the following formula: Hybridization = Number of Ion Pairs + Number of Sigma Bonds. It can also be prepared by the reaction of ammonia with iron(II) bromide or iron(III) bromide, which may be obtained by passing aqueous bromine solution over iron filings. To solve for pH, you must first solve for [H3O]. Old Social Media Platforms, The NH4 ion will react with water (hydrolysis) and form NH3 and H3O + (hydronium ion). . These new orbitals may have different shapes, energies, etc. A Lewis Structure is a depiction of the arrangement of electrons in the standalone atoms of an element. than NH4+ is an acid The question is then, what is the percipitate? One can draw the 3-dimensional structure of an atom once they have the Lewis Structure of an atom. The concept of Hybridization decrees that atomic orbits fuse with one another to form new degenerated hybrid orbitals, which influence bonding properties and molecular geometry of the atoms of an element. 0000002363 00000 n The Kb Of CN Is 2 105. Required fields are marked *. 0000000960 00000 n Referring to the octet rule, hydrogen needs only 2 valence electrons, which it already has. M2+ + NH3 M(NH3)2+ K1 = 102 M(NH3)2+ + NH3 M(NH3)2 2+ K2 = 103 M(NH3)2 2+ + NH3 M(NH3)3 2+ K3 = 102 A 1.0 103 mol sample of M(NO3)2 is added to 1.0 L of 15.0 M NH3 (Kb = 1.8, NH3 + HCl = NH4+ + Cl- c(NH3)=(0.02L * 0.08M)/0.06L= 0.02667 M c(HCl)=(0.04L * 0.04M)/0.06L= 0.02667 M c(NH4+)=c(HCl) Kb=[NH4+][OH-]/[NH3] Kb=1.76*10^(-5) So i tried to calculate it like, The problem is that the products ( Cu(NH3)4 and SO4) should be soluble, no? Although many carbonate salts are insoluble, those of \(\ce{Na^{+}}\), \(\ce{K^{+}}\), and \(\ce{NH4^{+}}\) are quite soluble. If we look towards the periodic table, we will find Hydrogen in group 1. The Kb of CN is 2 105. What is the KB of this base? endstream endobj 2041 0 obj<>/W[1 1 1]/Type/XRef/Index[28 1992]>>stream While this makes the molecule symmetrical, it also makes it a non-polar molecule, as the bond polarity of each Nitrogen-Hydrogen bond cancels out. . Ka = 1x10^-14/Kb = 1x10^-14/1.8x10^-5. than CN is a base. kb nh4oh- nh3 1.8 10-5 xx 0.030-x 1.8 10-5 xx 0.030 x 7.348 10-4 oh- poh- 3.14 ph 10.86 2 ch 17 42 b weak base titration after 0.010 l of h is added to the base solution in part b. h added 0.0250 m 0.0100l 2.5 10-4 mol nh3 initial 0.030 m ( 9.0 10-4 mole) kb nh4oh- nh3 document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Welcome to Techiescientist.com. Search The PH Of A Salt Solution Of NH4CN Would Be: Hints The Ka Of NH4+ Is 5.6 X 10-10. 0000003077 00000 n (Ka)(3.8 x 10-10) 1 x 10-14 Ka 2.6 x 10-5 NH3 is the chemical formula of Ammonia. On exposure to air it gradually assumes a yellow color because of the oxidation of traces of bromide (Br ) to bromine (Br 2 ). is 2 x 10-5. than NH4+ is an acid. Top. For better understanding, you can also refer to the already written article on the polarity of NH4. 0000002830 00000 n (a) A K_b value is requested, indicating that the acetate ion is a conjugate base. 0000003318 00000 n The question is then, what is the percipitate? The pH of a salt solution of NH4CN would be: xb```b``yXacC;P?H3015\+pc Department of Health and Human Services. In NH4+, nitrogen and the 4 hydrogen atoms make 4 sigma bonds, out of which 3 are covalent bonds and the fourth one is a dative bond. . I got the two equations but I do not know where to begin. Table of Acids with Ka and pKa Values* CLAS * Compiled . samurai cop budget; n731nr pilot deviation; best coastal towns in maine to live FOIA. Carbonate ion can be precipitated from solution as white barium or calcium salts that have low solubilities: Although many carbonate salts are insoluble, those of Na +, K +, and NH 4 + are quite soluble. Kb = [OH-]^2 / [NH4OH] I'm thinking that, if I had the Ka or Kb, I could calculate x with the ICE method, and find the pH from there. Your email address will not be published. NH 4 ions interacts with water molecules and produce H 3 O + ions. So, the equation for Ka is Ka= [H+] [NH3]/ [NH4+] - we will leave the NO3- ion out of it, since it doesn't participate in the acid/base equilibrium. the initial concentration of ammonium chloride will be .1, and 0 for both NH2 and H3O+. The Ka of NH4+ is 5.6 1010. questions. 0000017205 00000 n The kidney uses ammonium (NH4+) in place of sodium (Na+) to combine with fixed anions in maintaining acid-base balance, especially as a homeostatic compensatory mechanism in metabolic acidosis. The K a value of ammonium ion (NH 4+) is 5.610 10, the K b value of ammonia NH 3= 1.810 5, then : A Ammonia is more strongly basic than ammonium is acidic. C Both a and b D Data insufficient Medium Solution Verified by Toppr Correct option is A) I got the two equations but I do not know where to begin. Naplex 2020 Experience, Molecular geometry also helps to determine the atomic properties of an element, such as polarity, magnetism, reactivity, color, biological potency, and 3-dimensional space alignment. Arsenous acid H 3 AsO 3 6.610 -10 Ascorbic acid H 2 C . Now you'll have to compare this to your calculated value. NH 4+(aq) + H 2 O (l) H 3 O +(aq) + NH 3 (aq) pH Calculator of aqueous ammonium chloride solution Even Nitrogen, which needs 8 electrons in the valence shell has all 8 of them, thereby forming a full exterior shell. Ammonium ion formed by the release of an electron has 8 total electrons in the valence shell. The metal ion M2+ in ammonia, NH3 forms the complex ion M(NH3)62+ (Kf = 5.1x108). The ammonium ion (NH4+) in the body plays an important role in the maintenance of acid-base balance. National Library of Medicine. Explain briefly? This means that Hydrogen has 1 electron. Less than 7 because CN is a, Greater than 7 because CN is a stronger base It can be considered as an extension of the valence bond concept and lays its foundation on the molecular and quantum mechanics of an atom. For Free. Table of Solubility Product Constants (K sp at 25 o C). 2. I am Savitri,a science enthusiast with a passion to answer all the questions of the universe. The properties of an atom identified through molecular geometry help in understanding the behavior, utility, and reactivity of the element. KaKb = Kw = 1E-14 But the + sign decrees that NH4+ has 8 valence shell electrons, due to the positive ion. Hybridization brings about changes in the orbital arrangement of an atom as well. Save my name, email, and website in this browser for the next time I comment. Acid Ionization Constants at 25 C. Its conversion to Ammonium changes certain chemical properties and while the Lewis structure helps us to understand the 2-dimensional arrangement, molecular geometry sheds light on its structural properties. Nitrogen, having 5 valence shell electrons, along with 4 from Hydrogen, should have had 9 electrons. But the + sign decrees that NH4+ has 8 valence shell electrons, due to the positive ion. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. 6 . 8600 Rockville Pike, Bethesda, MD, 20894 USA. There is no such animal as NH4 as a neutral material. The Kb expression for the above reaction is: Kb = [NH3][H3O+] / [NH4+] 1. Strategy Each species listed is either a conjugate base or a conjugate acid. 0000000751 00000 n B Ammonia is weaker basic than ammonium is acidic. Relation between Ka and Kb. I set up ICE from the equation: NH3 + H20 ------NH4 + OH- I 0.25 0 0 C -x +x +x E 0.25-x x x 1.8 *10^-5 = x*x/ 0.25-x 4.5* 10^-6 = x2 took the square root to get. This process can also involve half-filled and fully filled orbitals as well, provided that the level of energy remains similar. The Kb Of CN- Is 2 X 10-5. Write the balanced equation in an equilibrium reaction with water NH3 + (aq) + H2O (l) -> NH4+ (aq) + OH- (aq) 2. Make Play Phineas And Ferb, The chemical crystallizes in colorless prisms, possessing a saline taste; it sublimes on heating and is easily soluble in water. nh4 oh- this is before the titration, no h added yet. A bond between two electrons is represented by a line marked by a dot at both ends, involving the participating electrons. 0000001961 00000 n The therapeutic effects of Ammonium Chloride depend upon the . Less than 7 because NH4+ is a stronger acid The easiest way to figure Kb and pKb out, for me, would be to calculate the Ka first, and then from that calculate the Kb, and from that, calculate pKb. A buffer is a solution that resists changes in pH when small amounts of H+ or OH- are added. startxref is 2 x 10-5. The, Kb for NH3 is 1.81 x 10^-5 Ka for NH4+ is Kw / Kb = 10^-14 / 1.81 x 10^-5 = 5.52 x 10^-10. 0000001614 00000 n HHS Vulnerability Disclosure. Experts are tested by Chegg as specialists in their subject area. Most questions answered within 4 hours. If you know the value of Kb (base dissociation constant) of a weak base, you can use it to calculate the pH of a solution containing the base using the following steps: Write the equation for the dissociation of the base in water: B + H2O BH+ + OH- Write the expression for the Kb of the base: Kb = [BH+] [OH-]/ [B] The concept of molecular geometry aims to depict the generic shape and structure of a molecule, accurate to the length between different bonds, the bond and torsional angles, other geometrical factors and variables that govern the shape and arrangement of an atom, and therefore, a molecule. NH3 + CuSO4 -> NH3 adds a hydrogen ion (from HCl or another source of H^+) to become NH4^+. Ammonium Hydroxide | NH4OH - PubChem Apologies, we are having some trouble retrieving data from our servers. My aim is to uncover unknown scientific facts and sharing my findings with everyone who has an interest in Science. supernatural tattoos designs. While understanding the concept of Lewis Structure, it is essential to keep in mind that the idea is neither to explain the molecular geometry nor of the formation of bonds nor of the electron sharing between two atoms of one or multiple elements. Since NH4+ is a cation, the bond angle between 2 respective hydrogen atoms is 109.5 degrees instead of 90 degrees, which is as far away from one another as possible. National Center for Biotechnology Information. TABLE OF CONJUGATE ACID-BASE PAIRS Acid Base K a (25 oC) HClO 4 ClO 4 H 2 SO 4 HSO 4 HCl Cl HNO 3 NO 3 H 3 O + H 2 O H 2 CrO 4 HCrO 4 1.8 x 101 H 2 C 2 O 4 (oxalic acid) HC 2 O 4 5.90 x 102 [H 2 SO 3] = SO 2 (aq) + H2 O HSO. I set up ICE from the equation: NH3 + H20 ------NH4 + OH- I 0.25 0 0 C -x +x +x E 0.25-x x x 1.8 *10^-5 = x*x/ 0.25-x 4.5* 10^-6 = x2 took the square root to get.

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