Question

When dissolved in aqueous solution, which pair would behave as a buffer?

A) HCl and NaCl
B) KOH and KCl
C) HNO2 and NaNO2
D) HNO3 and NH4NO3
E) Ca(OH)2 and CaSO4

Answer 1

The pair that behaves as a buffer when dissolved in an aqueous solution is
`HNO_2` and
`NaNO_2` (Option C) , as it consists of a weak acid and its conjugate salt.

Step-by-step explanation:

When dissolved in aqueous solution, the pair that would behave as a buffer is C)
`HNO_2` and
`NaNO_2`.

A buffer solution consists of a weak acid or weak base and its conjugate salt. In this pair,
`HNO_2` is nitrous acid, a weak acid, and
`NaNO_2` is the salt consisting of its conjugate base, the nitrite ion
`(NO_2^-)`. This combination can resist changes in pH when small amounts of acid or base are added.

Answer 2

option D is our right answer.