Question

1. A Buffer Solution is 0.100 M in both HC7H5O2 and LiC7H5O2 andhas a pH of 4.19. Which of the following pH values would you expectfrom the addition of a small amount of a dilute solution of astrong base?

- 3.89
- 3.69
- 5.69
- 4.49
- There is not enough information.

2. Which of the following acids (listed with Ka values) and theirconjugate base would form a buffer with a pH of 2.34?
- HC7H5O2, Ka=6.5 x 10^-5
- HF, Ka=3.5 x 10^-4
- HClO, Ka=2.9 x 10^-8
- HCN, Ka=4.9 x 10^-10
- HClO2, Ka=1.1 x 10^-2

3. A 1.0 L buffer solution is 0.250 M HC2H3O2 and 0.050 MLiC2H3O2 . Which of the following actions will destroy thebuffer?
a.) adding 0.050 moles of LiC2H3O2
b.) adding 0.050 moles of HC2H3O2
c.) adding 0.050 moles of HCl
d.) adding 0.050 moles of NaOH
e.) none of the above will destroy the buffer

4. A 1.0 L buffer solution is 0.050 M HC2H3O2 and 0.250 MLiC2H3O2 . Which of the following actions will destroy thebuffer?
a.) adding 0.050 moles of LiC2H3O2
b.) adding 0.050 moles of HC2H3O2
c.) adding 0.050 moles of HCl
d.) adding 0.050 moles of NaOH
e.) none of the above will destroy the buffer