Calculate the pH of the buffer solution that results from mi

Calculate the pH of the buffer solution that results from mixing 65.0 mL of 0.15 M HCHO2 with 40.0 mL of 0.13 M NaCHO2. The Ka for HCHO2 is 1.8 x 10^-4.

Solution

First off we need to decide which of these is our acid and which is the base.

HCHO2 is formic acid - so it\'s the acid
NaCHO2 is sodium formate. In an aqueous solution it is present as a sodium ion (Na+) and a formate ion (CHO2-) because of the negative charge on the formate it can accept an H+ and is a base.

Now since we\'re working with a buffer we can use the Henderson