Homework 9

Homework 9 - markowitz(am45362 – H09 pH curves Indicators...

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Unformatted text preview: markowitz (am45362) – H09: pH curves Indicators – mccord – (51625) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points At the stoichiometric point in the titration of 0.130 M HCOOH(aq) with 0.130 M KOH(aq), 1. [HCO- 2 ] = 0.130 M. 2. the pH is less than 7. 3. the pH is 7.0. 4. [HCOOH] = 0.0650 M. 5. the pH is greater than 7. 002 10.0 points What is the pH at the half-stoichiometric point for the titration of 0.22 M HNO 2 (aq) with 0.01 M KOH(aq)? For HNO 2 , K a = 4 . 3 × 10- 4 . 1. 7.00 2. 2.16 3. 2.01 4. 3.37 5. 2.31 003 10.0 points For the titration of 50.0 mL of 0.020 M aque- ous salicylic acid with 0.020 M KOH(aq), cal- culate the pH after the addition of 55.0 mL of KOH(aq). For salycylic acid, p K a = 2.97. 1. 10.98 2. 7.00 3. 12.30 4. 11.26 5. 12.02 004 10.0 points Consider the titration of 50.0 mL of 0.0200 M HClO(aq) with 0.100 M NaOH(aq). What is the formula of the main species in the solution after the addition of 10.0 mL of base? 1. ClOH 2. ClO- 3. NaOH 4. HClO 2 5. ClO 2 005 10.0 points You have a solution that is buffered at pH = 2.0 using H 3 PO 4 and H 2 PO- 4 (p K a1 = 2 . 12; p K a2 = 7 . 21; p K a3 = 12 . 68). You decide to titrate this buffer with a strong base. 15.0 mL are needed to reach the first equivalence point.are needed to reach the first equivalence point....
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This note was uploaded on 09/19/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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Homework 9 - markowitz(am45362 – H09 pH curves Indicators...

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