1. Solve for the pH of a solution that has 0.100 M HClO and 0.075 M NaClO. The K

Question

1. Solve for the pH of a solution that has 0.100 M HClO and 0.075 M NaClO. The K­a­­ (HClO) = 2.9 X 10-8

2. If 0.01 moles of strong base was added to a 2.00 L of the solution described in Question 1, what change do you expect to occur in the pH?

a. no change in pH

b. pH increases by more than 1

c. pH increases by less than 1

d. pH decreases by less than 1

e. pH decreases by more than

3. What is the buffer range for the solution described in Question 1?

a.7.3 to 9.3

b. 3.5 to 10.5

c. 3.5 to 4.5

d. 5.5 to 8.5

e. 6.5 to 8.5

Explanation / Answer

1.

this is a buffer

pH = pKa + log(NaClO/HClO)

Ka = 2.9*10^-8

pKa = -log( 2.9*10^-8) = 7.537

pH = 7.537 + log(0.075/0.1)

pH = 7.41

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