E2_S08 - 2 are mixed with 100 mL of 0.8 M formic acid...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Exam #2 Chemistry 112 Spring 2008 Name: ___________________________ Last 4digits of SSN: ________ For ALL pH questions, express the answer to 2 decimal places !!! Write neatly !!! Show all work !!! [H 3 O + ][OH - ] = 1 x 10 -14 = k w pH + pOH = 14 = pk w pX= - log(X), whatever “X” is. pH = - log[H 3 O + ] [H 3 O + ] = 10 - pH pOH = - log[OH - ] [OH - ] = 10 - pOH [HA] ] ][A O [H k 3 a + = ] [A ] [HA][OH [BOH] ] ][OH [B k b + = or k a k b = k w pk a + pk b = pk w pH = pk a + log n b n a = a b a C C log pk + ay 2 + by + c = 0 y = b ± b 2 4ac 2a
Background image of page 1

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

View Full DocumentRight Arrow Icon
1. (10 points) List the following solutions in the order from most acidic to most basic: 0.2 M NaCl 0.1 M HI 0.18 M CH 3 COONa 0.45 M Ca(OH) 2 0.217 M NH 4 Br
Background image of page 2
2. (15 points) Calculate the pH of a mixture of 20 mL of 0.2 M Sr(OH) 2 and 30 mL of 0.15 M CH 3 COOH. K a (CH 3 COOH) = 1.8×10 -5 .
Background image of page 3

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

View Full DocumentRight Arrow Icon
3. (15 points) What is a final pH when 20 mL of 0.3 M of Ba(OH)
Background image of page 4
Background image of page 5

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

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 2 are mixed with 100 mL of 0.8 M formic acid (HCOOH), and 200 mL of 0.1 M lithium formate (HCOOLi); K a (HCOOH)= 1.810-4 . 4. (10 points) Calculate the pH of 0.3 M solution of hydrazine N 2 H 4 , its K b =1.710-6 . 5. (15 challenge bonus points). How many grams of dry NaOH have to be added to 150 mL of water to make a solution with pH=12.5? 6. (50 points) Titration: This is a multi-step problem. Calculate the pH for the titration of 20 mL of 0.80 M benzoic acid C 6 H 5 COOH, pK a = 4.20, with 0.4 M RbOH. a) (11 points) Before any base is added. b) (13 points) After 20 mL of base is added. c) (13 points) After 40 mL of base is added d) (13 points) After 60 mL of base is added...
View Full Document

This note was uploaded on 10/03/2011 for the course CHEM 112 taught by Professor Chen during the Spring '09 term at South Carolina.

Page1 / 7

E2_S08 - 2 are mixed with 100 mL of 0.8 M formic acid...

This preview shows document pages 1 - 7. Sign up to view the full document.

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