A student standardizes an aqueous solution of sodium hydroxide, \(\text{NaOH(aq)}\), by titrating it against potassium hydrogen phthalate, \(\text{KHC}_8\text{H}_4\text{O}_4\) (molar mass \(204.2 \text{ g/mol}\), abbreviated as \(\text{KHP}\)). The student massed a sample of pure solid \(\text{KHP}\) on an analytical balance, transferred it completely to an Erlenmeyer flask, and dissolved it in approximately \(50 \text{ mL}\) of distilled water. Before titrating with \(\text{NaOH(aq)}\) from a buret, the student rinsed the inner walls of the Erlenmeyer flask with an additional \(15 \text{ mL}\) of distilled water to ensure all solid was in the solution. Which of the following best explains the effect of adding this additional distilled water on the calculated molarity of the \(\text{NaOH(aq)}\) solution?