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Aqueous Equilibria

What is the common ion effect?

What is a buffer solution?

When solving problems for a buffer solution you can bypass the ICE chart and

use the Henderson-Hasselbalch equation instead. What is the Henderson-

Hasselbalch equation?

What is an equivalence point?

For a strong acid and weak base reaction the equivalence point has a pH __ 7.

Why?

For a strong base and weak acid reaction the equivalence point has a pH __ 7.

Why?

Identify the buffer?

a. HCl

and NaClO

b. HClO and LiClO

c. HF and KF

d. CH

and CH

Determine the pH of the following solutions

-4

a. 1.00 L solution of 1.00M HNO

and 1.50M NaNO

. (K=a+ = 4 x 10

)

b. The solution in part a after 0.200 moles HCl has been added.

-10

c. 25.0g of NH

and 40.0g NH

in 5010 mL of water. (K

= 5.6 x 10

)

d. The solution in part c after 0.02 mol of NaOH has been added.

Calculate the pH when 80. mL of 0.25M KOH is added to 40. mL of 0.50M

-8

HClO. (K

= 3 x 10

)

10.

What is buffer cpacity?

11.

Consider

0.1 M NaF and 0.1M HF

1.0M NaF and 1.0M HF

Aqueous Equilibria