The constant acidity and basicity of a buffer solution is due to........

  • A
    The added acid and base remain in unionized form.
  • B
    The acid and base present in it protect against other ions.
  • C
    It contains a very large amount of ions.
  • D
    It has a specific value.

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$20 \ mL$ of $0.1 \ M \ H_2SO_4$ is added to $30 \ mL$ of $0.2 \ M \ NH_4OH$ solution. The $pH$ of the resultant mixture is [$pK_b$ of $NH_4OH = 4.7$].

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$A$ buffer solution is prepared by mixing $0.01 \ M$ $HCN$ and $0.02 \ M$ $NaCN$. If $K_{a}$ for $HCN$ is $6.6 \times 10^{-10}$,what is the concentration of $H^{+}$ ions in the solution?

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