2. use the henderson-hasselbalch equation to estimate the ph of a buffer solution that is composed of 20 ml of 10 m sodium formate and 20 ml of 1 m formic acid. (note: the pka of formic acid is 3.75).

pH of buffer =4.75

Explanation:

The pH of buffer solution is calculated using Henderson Hassalbalch's equation:

Given:

pKa = 3.75

concentration of acid = concentration of formic acid = 1 M

concentration of salt =  concentration of sodium formate = 10 M

pH of buffer =4.75

c (diamond),

sio2 (quartz)

the answer would be a