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# Which of the following mixtures will be buffers?A ) ${\text{C}}{{\text{H}}_3}{\text{COOH + C}}{{\text{H}}_3}{\text{COON}}{{\text{H}}_4}$B ) ${\text{HCl + NaCl}}$C ) Borax + boric acidD ) ${\text{C}}{{\text{H}}_3}{\text{COOH + C}}{{\text{H}}_3}{\text{COONa}}$

Last updated date: 06th Sep 2024
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Hint: An acid buffer solution is a mixture of weak acid and its salt with strong base. A basic buffer solution is the mixture of weak base and its salt with strong acid.

A ) ${\text{C}}{{\text{H}}_3}{\text{COOH + C}}{{\text{H}}_3}{\text{COON}}{{\text{H}}_4}$ is a mixture of weak acid (acetic acid) and its salt ammonium acetate with weak base (ammonia). Hence, it is not a buffer solution.
B ) ${\text{HCl + NaCl}}$ is a mixture of strong acid (hydrochloric acid) and its salt sodium chloride with strong base (sodium hydroxide). Hence, it is not a buffer solution.
D ) ${\text{C}}{{\text{H}}_3}{\text{COOH + C}}{{\text{H}}_3}{\text{COONa}}$ is a mixture of weak acid (acetic acid) and its salt sodium acetate with strong base (sodium hydroxide). Hence, it is an acid buffer solution.