Which of the following pH values are within the buffer range for a buffer containing 0.5 M CH3COOH and 0.5 M CH3COONa? T...
Which of the following pH values are within the buffer range for a buffer containing 0.5 M CH3COOH and 0.5 M CH3COONa? The Ka for CH3COO– is 1.8×10–5. Select any answers that apply. Multiple tries are permitted; however, 25% (1/4) point will be deducted for each incorrect response.
Select one or more:
2.76
5.09
0.57
3.81
8.11
Homework Answers
Ka = 1.8*10^-5
pKa = - log (Ka)
= - log(1.8*10^-5)
= 4.75
use:
pH = pKa + log {[conjugate base]/[acid]}
= 4.75+ log {0.5/0.5}
= 4.75
Buffer capacity is pH-1 to pH+1
That is from 3.75 to 5.75
pH in this range are:
5.09, 3.81
Answer: 5.09, 3.81
Add Answer to:
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