Which of the following pairs cannot be combined to make a buffer solution?


  1. HNO2 and NaNO2.
  2. NaOH and NaCl
  3. HC1 and KC1
  4. HNO3 and NH4NO3


Answer:- 1.HNO2 and NaNO2

  1. Is the correct answer.


The majority of essential buffer keys are composed of a mixture of weak acids and their salts or weak bases and their salts.

Buffer solutions are resistant to pH change because equilibrium exists between the acid and their conjugate base or the base and this is conjugate acid.

Among the following substances, NaOH is a strong base, whereas HCl and HNO3 are strong acids and so cannot be employed as buffers.  HNO2 is a weak acid, while NaNO2 is a salt.


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