Homework 6-solutions - phan (dtp377) – Homework 6 –...

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Unformatted text preview: phan (dtp377) – Homework 6 – sutcliffe – (51045) 1 This print-out should have 17 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This HW covers through the end of Chapter 7 and will be on Exam 3. 001 10.0 points A diprotic acid H 2 A has values of K a1 = 1 . × 10- 6 and K a2 = 1 . × 10- 10 . What is the [A 2- ] in a 0.10 M solution of H 2 A? 1. 1 . × 10- 10 M correct 2. 0.10 M 3. 3 . 2 × 10- 4 M 4. 3 . 2 × 10- 6 M 5. 0.20 M Explanation: 002 10.0 points What is the pH of a 0.020 M solution of hydrosulfuric acid, a diprotic acid? K a1 = 1 . 1 × 10- 7 K a2 = 1 . × 10- 14 1. 9.67 2. 4.69 3. 7.84 4. 5.22 5. 7.00 6. 4.33 correct 7. 3.65 Explanation: Solve using ONLY the 1st ionization. So this works like any other monoprotic acid where the assumption [H + ] = radicalbig (Conc)( K a1 ) is valid. 003 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) correct Explanation: 004 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?...
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This note was uploaded on 03/26/2012 for the course CHEM 302 taught by Professor Mccord during the Fall '10 term at University of Texas at Austin.

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Homework 6-solutions - phan (dtp377) – Homework 6 –...

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