A buffer solution is prepared by mixing 10 ~mL of 1.0 M acetic acid and 20 ~mL of 0.5 M sodium acetate and then diluted to 100 ~mL with distilled water, The pH of the buffer solution is ( p K_a of acetic acid is 4.76 )

Step-by-step solution

Milliequivalents of acetic acid =10 ~mL 1.0 M Milliequivalents of sodium acetate =2.0 ~mL 0.5 M From Henderson equation, pH = p K_a+ [ salt acid ] Here, p K_a=4.76 [For acetic acid] aligned pH & =4.76+ ( 0.5 20 10 1.0 ) pH & =4.76 aligned Hence, option (d) is correct.