Which of the following is a buffer solution? | Chemistry | SolveeIt

Question

Which of the following is a buffer solution?

$NaOH+NaCl$

$NaOH+N{{a}_{2}}C{{O}_{3}}$

$C{{H}_{3}}COOH+C{{H}_{3}}COONa$

None of the above

Answer

$C{{H}_{3}}COOH+C{{H}_{3}}COONa$

Explanation

Solution

Buffer solutions are aqueous solutions composed of a combination or a mixture of a neutral or a very weak acid and its conjugate base. The main purpose of a buffer solution is to resist the pH change. This way, if an acid or base is added into it, pH of the solution won't be affected. The acid or base applied is neutralized.

Among the four options; only option C contains acetic acid CH3COOH, a weak acid. The equation given in this option is a mixture of acetic acid, which is a weak acid, and sodium acetate CH3COONa, which is the salt of a weak acid.

Thus, Option C CH3 COOH+CH3 COONais the correct answer.

Chemistry Question on Buffer Solutions

Solution