hw11 - (a) At room temperature how many moles of Bi 2 S 3...

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3.091 Fall Term 2004 Homework #11 November 18, 2003 (to be tested 11/23 ) from Module Chapter 4 “Solubility Equilibria”: 4, 8, 10, 16, 26, 29 from Main Text Chapter 11 “Acids and Bases”: 5, 6, 13, 35, 50, 52, 64, 85, 89 plus the following problems. 1. (a) Identify the conjugate acid-base pairs in the following reactions: (i) HI ( aq ) + H 2 O ( l ) H 3 O + ( aq ) + I ( aq ) (ii) CH 3 COOH ( aq ) + OH ( aq ) CH 3 COO ( aq ) + H 2 O ( l ) (iii) NH 3 ( aq ) + H 2 O ( l ) NH 4 + ( aq ) + OH ( aq ) (b) Identify which of the following cannot be a Brønsted base and give a reason for your choices: H 3 O + , AlCl 4 , CN , O 2 , SiH 4 , AsH 3 . (c) Estimate the p H and p OH of a 0.03091 M solution of hydroiodic acid ( K a 10 9 ). 2. Bi 2 S 3 dissolves in water according to the following reaction: Bi 2 S 3 ( s ) 2 Bi 3+ ( aq ) + 3 S 2- ( aq ) for which the solubility product, K sp , has the value of 1.6 × 10 -72 at room temperature.
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Unformatted text preview: (a) At room temperature how many moles of Bi 2 S 3 will dissolve in 3.091 10 6 liters of water? (b) How many Bi 3+ ions will be found in the solution described in part (a)? 3 . Calculate the volume of 0.25 M NaI that would be needed to precipitate all the Hg 2+ ion from 45 mL of a 0.10 M Hg(NO 3 ) 2 solution according to the following reaction: 2 NaI( aq ) + Hg(NO 3 ) 2 ( aq ) HgI 2 ( s ) + 2 NaNO 3 ( aq ) 4. (a) Strontium fluoride, SrF 2 , has a K sp value in water of 2.45 10 9 at room temperature. Calculate the solubility of SrF 2 in water. Express your answer in units of molarity. (b) Calculate the solubility of SrF 2 in 0.03 M NaF ( aq ). Express your answer in units of molarity. Assume that NaF is completely dissociated in water....
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