This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: hernandez (ah29758) Homework 6 sutcliffe (51045) 1 This printout should have 17 questions. Multiplechoice 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. 3 . 2 10 4 M 2. 0.20 M 3. 0.10 M 4. 1 . 10 10 M correct 5. 3 . 2 10 6 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. 5.22 2. 7.84 3. 4.33 correct 4. 3.65 5. 4.69 6. 7.00 7. 9.67 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( ) H 2 SO 3 (aq) + OH (aq) 2. H 2 SO 3 (aq) + 2 H 2 O( ) SO 2 3 (aq) + 2 H 3 O + (aq) 3. HSO 3 (aq) + H 2 O( ) SO 2 3 (aq) + H 3 O + (aq) correct 4. SO 2 3 (aq) + H 2 O( ) HSO 3 (aq) + OH (aq) 5. H 2 SO 3 (aq) + H 2 O( ) HSO 3 (aq) + H 3 O + (aq) 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?...
View
Full
Document
This note was uploaded on 11/17/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.
 Spring '07
 Holcombe

Click to edit the document details