In an acid-base titration, 0.1 M HCl solution was added to the NaOH solution of unknown strength. Wh

Question

In an acid-base titration, 0.1 M HCl solution was added to the NaOH solution of unknown strength. Which of the following correctly shows the change of pH of the titration mixture in this experiment?

Professor PC Thomas Classes · Answer

(c) : Initially, we have only NaOH solution in a flask so, its pH value is highest as it is a base. When 0.1 M HCl solution is added to NaOH solution, pH value will decrease until it becomes 7 due to neutralisation. Then pH value decreases further as more HCl is added in excess.