1. Calculate the pH of a buffer solution that is 0.20 M in sodium hypobromite (NaBrO) and 0.10 M in hypobromous acid (Ka of HBrO= 2.5 ×10−9)
| a |
4.15 |
|
| b |
4.45 |
|
| c |
8.60 |
|
| d |
8.90 |
|
| e |
8.30 |
2. A buffer solution after the addition of 20.0 mL of 1.00 M NaOH solution to 500.0 mL of a buffer solution containing 0.20 M acetic acid (CH3COOH) and 0.30 M sodium acetate (CH3COONa). [Ka= 1.8 ×10–5]
What is the new concentration of CH3COOH after buffering?
a. 0.2437
b. 0.2014
c. 0.1615
d. 0.3213
e. 0.2589
3. A buffer solution after the addition of 20.0 mL of 1.00 M NaOH solution to 500.0 mL of a buffer solution containing 0.20 M acetic acid (CH3COOH) and 0.30 M sodium acetate (CH3COONa). [Ka= 1.8 x 10–5]
What is the new concentration of NaOH after dilution?
| a |
0.0273 |
|
| b |
0.0439 |
|
| c |
0.0185 |
|
| d |
0.0267 |
|
| e |
0.0385 |
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