HW8 - estrada(gse77 – Homework 8 – Sutcliffe –(52410...

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Unformatted text preview: estrada (gse77) – Homework 8 – Sutcliffe – (52410) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Which equation represents K a2 for sulfurous acid? 1. HSO- 3 (aq) + H 2 O( ℓ ) → H 2 SO 3 (aq) + OH- (aq) 2. SO 2- 3 (aq) + H 2 O( ℓ ) → HSO- 3 (aq) + OH- (aq) 3. H 2 SO 3 (aq) + H 2 O( ℓ ) → HSO- 3 (aq) + H 3 O + (aq) 4. H 2 SO 3 (aq) + 2 H 2 O( ℓ ) → SO 2- 3 (aq) + 2 H 3 O + (aq) 5. HSO- 3 (aq) + H 2 O( ℓ ) → SO 2- 3 (aq) + H 3 O + (aq) 002 10.0 points The pH of 0.010 M H 3 PO 4 (aq) is 2.24. Esti- mate the concentration of HPO 2- 4 in the solu- tion. For H 3 PO 4 , the values of K a1 , K a2 , and K a3 are 7 . 6 × 10- 3 , 6 . 2 × 10- 8 , and 2 . 1 × 10- 13 , respectively. 1. 5 . 8 × 10- 3 M 2. 6 . 2 × 10- 8 M 3. 7 . 6 × 10- 3 M 4. 0.010 M 5. 2 . 1 × 10- 13 M 003 10.0 points Oxalic acid is a relatively strong diprotic acid with K 1 = 5 . 3 × 10- 2 and K 2 = 5 . 3 × 10- 5 . What is the [HC 2 O- 4 ] concentration in an ox- alic acid solution that is 0.10 M? 1. 0.073 M 2. 0.051 M 3. 0.027 M 4. 0.10 5. 5 . 3 × 10- 5 004 10.0 points What is the pH of a 0 . 21 M solution of benzy- lammonium chloride (C 6 H 5 CH 2 NH 3 Cl)? K b for benzylamine is 2 . 2 × 10- 5 . Your answer must be within ± 0.4% 005 10.0 points Note this is a SALT.. think about what it is made up of and what that will do in water!...
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This note was uploaded on 03/03/2012 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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HW8 - estrada(gse77 – Homework 8 – Sutcliffe –(52410...

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