Question

The pH of a buffer solution containing $25mL$ of $1M$ ${CH}_{3}COONa$ and $25mL$ of $1M$ ${CH}_{3}COOH$ will be appreciable affected by $5mL$ of:

• A. $1M$ ${CH}_{3}COOH$
• B. $5M$ $HCl$
• C. $5M$ ${CH}_{3}COOH$
• D. $1M$ ${NH}_{4}OH$

Answer 1

The correct option is B $5M$ $HCl$

The pH of a buffer solution will be affected by $5ml$ of $5MHCl$ because $HCl$ is strong acid it dissociates completely to give $H^{+}$ ions so $pH$ of buffer will be appreciably affected by 5mL of 5M $HCl$.