Question

20 mL of 0.2 M sodium hydroxide is added to 50 mL of 0.2 M acetic acid to give 70 mL of the solution. What is the pH of this solution. Calculate the additional volume of 0.2 M NaOH required to make the pH of the solution 4.74. (Ionisation constant of $C{H}_{3}COOH$ is $1.8\times {10}^{-5})$

• A. $pH=2.28,V=2.5mL$
• B. $pH=4.56,V=5mL$
• C. $pH=4.92,V=5.64mL$
• D. $pH=9.84,V=10mL$

Answer 1

The correct option is B $pH=4.56,V=5mL$