Homework #6-solutions-1

Homework #6-solutions-1 - gonzales (pag757) Homework #6...

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gonzales (pag757) – Homework #6 – Holcombe – (52460) 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points What is the pH oF a 0 . 13 M Ba(OH) 2 aqueous solution? 1. 1 . 3415 2. 13 . 415 correct 3. 0 . 585027 4. 10 . 0612 5. 8.7 Explanation: [Ba(OH) 2 ] = 0 . 15 M Ba(OH) 2 is a strong base which dissociates in aqueous solution to produce two moles oF OH - For every mole oF Ba(OH) 2 , so 0 . 13 M Ba(OH) 2 produces 0 . 26 M OH - . Ba(OH) 2 Ba 2+ + 2 OH - ini 0 . 13 M 0 M 0 M Δ - 0 . 13 M +0 . 13 M 2(0 . 13 M) fn 0 M +0 . 13 M +0 . 26 M pH = 14 - pOH = 14 - ( - log 0 . 26) = 13 . 415 002 10.0 points Solution A contains HCl and has a H + con- centration oF 10 - 5 M. Solution B contains CH 3 COOH and has an H + concentration oF 10 - 5 M. Which solution is more acidic and which solution has a greater pH? 1. Solution B is more acidic and has a greater pH. 2. Solution A is more acidic, but Solution B has a greater pH. 3. Both solutions have identical acidities and pH. correct 4. Solution A is more acidic and has a greater pH. 5. Solution B is more acidic, but Solution A has a greater pH. Explanation: [H + ] A = [H + ] B = 10 - 5 M pH = - log[H + ] We are told that both solutions have the same concentration oF H + , so they will have identical acidities and an identical pH. 003 10.0 points What would be the pH oF a solution oF hypo- bromous acid (HOBr) prepared by dissolving 9.7 grams oF the acid in 20 mL oF pure wa- ter (H 2 O)? The Ka oF hypobromous acid is
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This note was uploaded on 03/15/2010 for the course CH 52460 taught by Professor Holcombe during the Spring '10 term at University of Texas at Austin.

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Homework #6-solutions-1 - gonzales (pag757) Homework #6...

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