CHM116 week 6 disc probs - A student needs to make an...

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: A student needs to make an aqueous solution with pH = 9.0. Can this be done by simply diluting 1 M HCl? Explain below, showing calculations as necessary. 1. Problems for week 6 discussion Name a) Solid ammonium bromide (NH 4 Br) is added to pure water. Will the resulting solution be acidic, basic, or neutral? (Use a chemical equation to justify your answer) b) If the aqueous ammonium bromide solution made above has a pH of 8.5, what must be the concentration of ammonium ion? (NH 3 p K b = 4.75) 2. If added to 1 L of 0.20 M acetic acid (CH 3 COOH), which of these would form a buffer? a) 0.10 mole NaCH 3 COO b) 0.10 mole NaOH c) 0.10 mole HCl d) 0.30 mole NaOH 3. A buffer consists of 0.20 lactic acid (p K a = 3.85) and 0.30 M sodium lactate. a) Calculate the pH of this buffer b) Calculate the pH of this buffer after addition of 10.0 mL of 0.01 M HCl to 10.0 mL of the buffer 4. Vinegar must be at least 4% acetic acid by weight (0.67 M). If you titrate a 5.00 mL sample of vinegar with 0.100 M NaOH and find that you need 33.5 mL to reach the equivalence point, does your sample meet the 0....
View Full Document

This note was uploaded on 05/15/2011 for the course CHM 116 taught by Professor Matchett during the Fall '11 term at Grand Valley State University.

Page1 / 2

CHM116 week 6 disc probs - A student needs to make an...

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