Question

A buffer can be formed from the combination of A) 50.0 mL of 0.50 M HNO3 and 50.0 mL of 0.25 M KNO3. B) 50.0 mL of 0.50 M HNO3 and 50.0 mL of 0.50 mL of KNO2. C) 50.0 mL of 0.50 M HNO3 and 25.0 mL of 0.25 M KNO3 D) 50.0 mL of 0.50 M HNO3 and 25.0 mL of 0.75 M KNO2. E) 50.0 mL of 0.50 M HNO3 and 50.0 mL of 0.50 M KNO2.

Answer 1

Buffer Solution is a water solvent based solution which consists of a mixture containing a weak acid and the conjugate base of the weak acid, or a weak base and the conjugate acid of the weak base. They resist a change in pH upon dilution or upon the addition of small amounts of acid/alkali to them

so Here weak base is KNO₃ and and its conjugate acid is HNO₃

So Ans A as it has equal volume