A 100 mL beaker contains 10 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 NaOH and HCl are mixed, they will react to form NaCl (salt) and H2O (water). The reaction is as follows: 
NaOH + HCl → NaCl + H2O

As a result, the concentration of H+ ions will increase in the solution, leading to a decrease in pH. Therefore, the correct statement is that the pH of the beaker's contents falls. None of the other statements is correct as the concentration of Na+ ions, Cl- ions, and undissociated H2O molecules remain unchanged during the reaction.

A 100 ML Beaker Contains 10 ML of NaOH Solution