Class Notes (1,100,000)
CA (630,000)
UTSG (50,000)
CHM (800)
CHM135H1 (400)

Notes taken during lecture

Course Code
Kris Quinlan

This preview shows half of the first page. to view the full 3 pages of the document.
Slide No. Notes
Last class
No. 22
-weaker HA bond, easily dissociate
-HF v strong acid because F is small, therefore bond is shorter
-Darker – stronger
23 -more electronegative element, stronger acid strength
CH 15
1-base must contain OH- if water is to be formed
-K and Cl are spectator ions
-Kn is K of neutralization
-Weak acid and strong base is a reaction that goes to completion
3-Ans1: A
-Increase [A-], reaction shifts to use up added [A-] therefore making
more [HA]
- [HA] increases because of the addition of [A-] (Le Chatelier’s
principle) this is called the common-ion effect
-Ans2: A
-Equation constant stays the same
-Shift to the reactants side therefore use up some of the products
therefore less [H3O] therefore more [A-] to keep everything balanced
-Ans3: smaller [H3O+]
-CH3COOH + water -> CH3COO- + H3O+
-I: 0.50 M 0.5M 0M
-C: -x +x +x
-E: 0.50M-x 0.50M+x x
-Ka = [products]/[reactants] = (0.50+x)(x)/(0.50-x) = 1.8x10^-5
-Assume x <<0.50M
-Therefore x = 1.8x10^-5
-Assumption okay
- [H3O+] = x = 1.8x10^-5 M
-pH = 4.74
10 -EX.1
-pH = 2.52
-Strong base added – very reactive
-OH- + CH3COOH -> water + CH3COO-
-0.020mol/1.0L = 0.020M
-0.50 M
-Therefore all of OH- is reacted
-CH3COOH + water -> CH3COO- + H3O+
-I: 0.48 M 0.020M 0
-C: -x +x +x
You're Reading a Preview

Unlock to view full version