Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution ?

0.2 mole of NaCI with 0.2 mole of HNO3

0.4 mole of NH3 with 0.2 mole of HCI

0.0002M HCI

0.4 mole of CH3COOH with 0.4 mole of NaOH

Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution ?

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