Quiz 3 - Version 379 Quiz 3 Laude (52455) 1 This print-out...

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

View Full Document Right Arrow Icon

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

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

Unformatted text preview: Version 379 Quiz 3 Laude (52455) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 5.0 points A 300 mL sample of Ba(OH 2 ) is titrated to pH 7 with 400 mL of 0 . 045 M HClO 4 . What was the pH of the original Ba(OH 2 ) solution, before any HClO 4 was added? 1. 1 . 22 2. . 921 3. 13 . 1 4. 12 . 8 correct Explanation: Because the problem stipulates that the sam- ple was titrated to pH 7, we know that the moles of hydroxide ions in the analyte were equal to the number of moles of protons added by the titrant. n OH- = n H + V Ba(OH) 2 [OH- ] = V HClO 4 [H + ] [OH- ] = V HClO 4 V Ba(OH) 2 [H + ] = 400 300 . 045 = 0 . 06 pOH = 1 . 22 pH = 12 . 8 002 5.0 points Which of the following equations is useful in determining the equilibrium for an aqueous system containing vanadic acid (H 3 VO 4 )? 1. [H + ] = [H 2 VO- 4 ] + 2 [HVO 2- 4 ]+ 3 [VO 3- 4 ] 2. [H + ] = [OH- ] 3. [H 3 VO 4 ] = [H 2 VO- 4 ] + 2 [HVO 2- 4 ]+ 3 [VO 3- 4 ] 4. [H + ] = [OH- ] + [H 2 VO- 4 ] + [HVO 2- 4 ]+ [VO 3- 4 ] 5. C...
View Full Document

This note was uploaded on 05/11/2010 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

Page1 / 3

Quiz 3 - Version 379 Quiz 3 Laude (52455) 1 This print-out...

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