A beaker contains 100 mL of NaOH solution at pH = 13. A technician carefully pours into the beaker 10 mL of HCl at pH = 1. Which of the following statements correctly describes the results of this mixing?

Question

Quizplus · Accepted Answer

When HCl is added to the solution, it reacts with NaOH to form NaCl and water according to the following equation:

HCl + NaOH → NaCl + H2O

Since HCl is a strong acid and NaOH is a strong base, the reaction goes to completion and all the HCl and NaOH are consumed.

The reaction produces H+ and Cl- ions, which combine with OH- ions from NaOH to form water, decreasing the concentration of OH- ions in the solution. As a result, the pH of the solution decreases (becomes more acidic), indicating an increase in the concentration of H+ ions. Therefore, the correct statement is:

E) The pH of the beaker's contents falls.

A Beaker Contains 100 ML of NaOH Solution at PH