By adding 6 grams of NaOH to a 500 mL of buffer solution, its pH value changes from 3.8 to 4.2. Calculate the buffer capacity.

By adding 6 grams of NaOH to a 500 mL of buffer solution, its pH value

1.	By adding 6 grams of NaOH to a 500 mL of buffer solution, its pH value changes from 3.8 to 4.2. Calculate the buffer capacity.
Answer» Solution :MOLES of NAOH added PER one litre of buffer solution `= (12)/(40) =0.3` Buffercapacity `=("moles of base added ")/("change in pH")=( 0.3 )/( ( 4.2 -3.8 ))=( 0.3 )/( 0.4 ) = 0.75`