Question

calculate the pH of 30 mL 1Macetic acid and 30 ml 1M sodium acetate

Answer 1

Solution :-

Acetic acid and sodium acetate are the weak acid and its conjugate base

so the solution forms buffer

formula to calculate the pH of the buffer solution is as follows

pH= pka + log [base / acid]

now lets put the values in the formua

volume and molarities of both reactant are same

so they react with 1 :1 ratio

pka of acetic acid = 4.74

after addition solutions the volume will double so the concentrations will be halved

pH= 4.74 + log [0.5/0.5]

pH= 4.74+ 0

pH= 4.74