Lactic acid, CH
3
CHOHCO
2
H, is found in sour milk, in sauerkraut, and in muscles after
activity.
K
a
for lactic acid = 1.4 x 10
-4
.
a.
If 2.75 g of NaCH
3
CHOHCO
2
, sodium lactate, is added to 5.00 x 10
2
mL of 0.100 M
lactic acid, what is the pH of the resulting buffer solution?
b.
Is the final pH lower or higher than the pH of the lactic acid solution?
1 answer
Your posting leaves a little to be desired. It's quite difficult to interpret. For this problem, use the Henderson-Hasselbalch. Substitute the numbers and solve for pH.