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Catalyst: Tuesday February 4, 2014
Today’s Objective: -SWBAT use Ka/Kb to predict the strengths of acids and bases
-SWBAT solve problems using Ka and Kb
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Photo of the day
Ion Product Example
Complete on doc cam
Weak Acid (Using Ka)
Complete on doc cam
Table Talk
• You have a solution of the following acid:HOC6H5 (aq) + H2O (l) H3O+ (aq) + OC6H5
- (aq)• Given that the equilibrium concentrations are
[HOC6H5] = 0.062 M, [H3O+ ] = 1.5 x 10-4 M, and [OC6H5
- ] = 3.1 x 10-5 M, calculate the value of Ka.
⇌
Model
• Calculate the pH of a 0.036 M Nitric Acid (HNO3) solution
HNO3 D H+ + NO3-
Discussion Question
• Calculate the pH of a 0.036 M Sodium Hydroxide solution
NaOH D OH- + Na+
Quicket
Using the table below, which compound would you expect to be the strongest acid?
AB
C
D
Quicket
Using the table below, which compound would you expect to be the strongest acid?
Compound Kb Value
A) Phosphate 5.9 x 10-3
B) Carbonate 2.1 x 10-4
C) Ammonia 1.8 x 10-5
D) Aniline 9.5 x 10-7
Table Talk
• Calculate the Ka for the ammonium ion (Kb = 1.8 x 10-5)
Table Talk
• Consider the following two acids and their ionization constants:
HCOOH Ka = 1.7 x 10-4
HCN Ka = 4.9 x 10-10
Which conjugate base (HCOO- or CN-) is stronger?