Homework #8 - wong (sw25735) Homework #8 SWEENEY (615) This...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
wong (sw25735) – Homework #8 – SWEENEY – (615) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points ±or a triprotic acid, H 3 A, with pK a values oF 2.5, 6.5 and 10.5, what species is present in highest concentration when 1M H 3 A is bu²ered at pH 7? 1. HA 2 - 2. H + 3. H 3 A 4. A 3 - 5. H 2 A - 002 10.0 points A bu²er oF pH 3.000 is needed. Given solu- tions oF 0.200 M HNO 2 and 0.200 M KNO 2 , what volumes oF HNO 2 and KNO 2 are re- quired to make 1 L oF bu²ered solution? The ionization constant For KNO 2 is 4 . 00 × 10 - 4 . 1. 412 mL HNO 2 ; 587 mL KNO 2 2. 500 mL oF each 3. 714 mL HNO 2 ; 286 mL KNO 2 4. 286 mL HNO 2 ; 714 mL KNO 2 5. 587 mL HNO 2 ; 413 mL KNO 2 003 10.0 points A bu²er is made by adding 0.500 mol acetic acid and 0.500 mol sodium acetate to enough water to make a halF-liter solution. The bu²er is allowed to reach equilibrium. Calculate the change in pH aFter the addition oF 0.030 mol sodium hydroxide (neglect any volume changes). 1.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/07/2010 for the course CHEM 0436 taught by Professor Gabrielasmereanu during the Spring '10 term at CUNY Hunter.

Page1 / 3

Homework #8 - wong (sw25735) Homework #8 SWEENEY (615) This...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online