Question

Which of the following aqueous solutions are good buffer systems?
.
0.17 M hypochlorous acid + 0.20 M potassium hypochlorite
0.30 M calcium chloride + 0.29 M barium chloride
0.16 M calcium hydroxide + 0.23 M calcium chloride
0.30 M perchloric acid + 0.16 M sodium perchlorate
0.27 M ammonia + 0.37 M potassium hydroxide

Answer 1

A buffer solution is a mixture of weak acid and its salt with strong base. (or) weak acid and its conjugate base. (or) a weak base and its salt from strong acid (or) a weak base and its conjugate acid.

0.17 M hypochlorous acid + 0.20 M potassium hypochlorite   is a good buffer system.

0.16 M calcium hydroxide + 0.23 M calcium chloride is a good buffer system.

Only these two systems acts as buffers.

The remaining solutions doesnot form buffers.

0.30 M calcium chloride + 0.29 M barium chloride , in this both are salts.

0.30 M perchloric acid + 0.16 M sodium perchlorate , Perchloric acid is a strong acid.

0.27 M ammonia + 0.37 M potassium hydroxide   , in this potassiumhydroxide is a strong base.

hence the above three are not acts as buffers.