Tuesday
September 1, 2015

Homework Help: Chem

Posted by Charlie on Sunday, April 6, 2014 at 10:38am.

The following questions refer to the following system:
A total of 30.0 mL of a .10M solution of a monophonic acid (Ka = 1.0 x 10 ^-5) is titrated with .20M sodium hydroxide solution.

1) Before the titration begins, the pH of the solution is about
A) 2
B) 5
C) 7
D) 9
E) 12

2) Af the equivalence point, the pH of the solution is about
A) 2
B) 5
C) 7
D) 9
E) 12

3) The amount of NaOH required to reach the equivalence point is
A) 15.0 mL
B) 30.0 mL
C) 45.0 mL
D) 50.0 mL
E) 60.0 mL

4) The approximate pH of the solution when the weak acid is half neutralized is
A) 2
B) 5
C) 7
D) 9
E) 12

5) What is true of a buffer made from the weak acid that has a pH of 4.0?
A) [HA] = [A-]
B) [HA] = 10[A-]
C) 10[HA] = [A-]
D) 2[HA] = [A-]
E) [HA] = 2[A-]

Explanations would be appreciated

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