Which of the following aqueous solutions are good buffer systems?
0.25 m ammonium nitrate + 0.40 m ammonia
0.23 m nitric acid + 0.20 m sodium nitrate
0.16 m potassium hydroxide + 0.22 m potassium chloride
0.39 m hypochlorous acid + 0.25 m potassium hypochlorite
0.12 m hydrofluoric acid + 0.14 m sodium fluoride

0.25 M ammonium nitrate + 0.40 M ammonia  

0.39 M hypochlorous acid + 0.25 M potassium hypochlorite

0.12 M hydrofluoric acid + 0.14 M sodium fluoride  

Explanation:

A buffer consists of a weak acid and its salt or a weak base and its salt.

NH₃ is a weak base, and HClO and HF are weak acids.

B is wrong. HNO₃ is a strong acid.

C is wrong. KOH is a strong base.

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