A beaker contains 100 millilitres (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 result of this mixing?

Question

Quizplus · Accepted Answer

When NaOH (pH = 13) is mixed with HCl (pH = 1), a neutralization reaction occurs. The H⁺ ions from the HCl react with the OH⁻ ions from the NaOH to form water (H₂O). The remaining ions in solution are Na⁺ and Cl⁻, which do not contribute to the pH of the solution. The resulting solution will have a lower pH than the initial pH of 13, meaning the pH will decrease. Therefore, the correct choice is D. The concentration of Na⁺ ions does not change in the process of neutralization, so choice A is incorrect. The pH cannot increase to a value higher than the initial pH of 13, so choice B is incorrect. The resulting pH will not be neutral, so choice C is incorrect.

A Beaker Contains 100 Millilitres (ML) of NaOH Solution at PH