Question

How do you calculate the PH of a buffer solution prepared by mixing 75 mL of 1.0 M lactic acid and 25 mL of 1.0 M sodium lactate?
(acid) = 1M x 75/100 = ??
(salt) = 1 M x 25/100 = ??
Plug into the Henderson-Hasselbalch equation.
4.34
the pKa of lactic acid is 3.86

pH=3.86+ log[(25x1.0)÷(75x1.0-3)]

pH = 3.38

the pKa of sodium lactate 3.78

pH=3.78+ log[(25x1.0)÷(75x1.0-3)]

pH = 3.30

Related Questions

calculate pH of the buffer solution prepared by mixing 10 mL of 1.5 M HCl with 100 mL of 0.1 M K2CO3... Determine the pH of a buffer that is prepared by mixing 100 mL of 0.2 M NaOH and 150 mL of 0.4 M ace... The acetate buffer were prepared by mixing 0.1 M ch3cooh with 0.1M ch3cooNa in the ratio 8:2 and 2:8...