Which of the following combinations cannot produce a buffer solution? Select all that apply.

HF and NaF

HOCl and NaCl

HCN and LiCN

HClO4 and NaClO4

HNO2 and KNO2

H2SO4 and Na2SO4

NH4Cl and NaOH

NH3 and (NH4) 2SO4

- HOCl and NaCl.

- NH4Cl and NaOH.

Explanation:

Hello,

Considering that a buffered solution may contain a weak acid and its salt or a weak base and its salt, the following combinations can not produce a buffer:

- HOCl and NaCl because the salt should be NaClO (sodium hypochlorite).

- NH4Cl and NaOH because the base should be NH4OH (ammonium hydroxide) or the salt NaCl (sodium chloride).

Best regards.