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# Which of the following is a buffer solution?$A.{\text{ }}C{H_3}COOH + C{H_3}COONa \\ B.{\text{ }}NaCl + NaOH \\ C.{\text{ }}HCl + N{H_4}Cl \\ D.{\text{ }}C{H_3}COOH + HCl \\$

Last updated date: 20th Jun 2024
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Hint- In order to solve the given problem first we will understand the basic meaning of buffer solution also we will study about the characteristics of buffer solution and what are the uses of a buffer solution. Further we will study about the preparation of the buffer solution and find out which of the given options is a buffer solution.

- Amongst the given four options; only option A and option D contains acetic acid $C{H_3}COOH$ which is a weak acid. Option B has sodium chloride which is not an acid and option C has hydrochloric acid, which is a strong acid. So we have to now look into option A and option D.
As option A contains $C{H_3}COOH + C{H_3}COONa$ which is a mixture of acetic acid $C{H_3}COOH$ , which is a weak acid and sodium acetate $C{H_3}COONa$ which is the salt of weak acid.
Hence, $C{H_3}COOH + C{H_3}COONa$ is a buffer solution.So, option A is the correct option.