---
title: "A student performs a titration to determine the molar concentration of an unknown monoprotic acid, \\(\\text{HA(aq)}\\). The student rinses a buret with deionized water but fails to condition the buret with the standard \\(0.100\\text{ M }\\text{NaOH(aq)}\\) titrant solution prior to filling it. A \\(25.0\\text{ mL}\\) sample of \\(\\text{HA(aq)}\\) is transferred to an Erlenmeyer flask and titrated to the endpoint. Which of the following correctly predicts and explains the effect of this error on the calculated concentration of \\(\\text{HA(aq)}\\)?"
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url: "https://nerd-notes.com/ubq/119865/"
date_modified: "2026-08-21T08:16:31+00:00"
---

# A student performs a titration to determine the molar concentration of an unknown monoprotic acid, \(\text{HA(aq)}\). The student rinses a buret with deionized water but fails to condition the buret with the standard \(0.100\text{ M }\text{NaOH(aq)}\) titrant solution prior to filling it. A \(25.0\text{ mL}\) sample of \(\text{HA(aq)}\) is transferred to an Erlenmeyer flask and titrated to the endpoint. Which of the following correctly predicts and explains the effect of this error on the calculated concentration of \(\text{HA(aq)}\)?

A student performs a titration to determine the molar concentration of an unknown monoprotic acid, \(\text{HA(aq)}\). The student rinses a buret with deionized water but fails to condition the buret with the standard \(0.100\text{ M }\text{NaOH(aq)}\) titrant solution prior to filling it. A \(25.0\text{ mL}\) sample of \(\text{HA(aq)}\) is transferred to an Erlenmeyer flask and titrated to the endpoint. Which of the following correctly predicts and explains the effect of this error on the calculated concentration of \(\text{HA(aq)}\)?

- **A.** The calculated concentration will be too low because residual water in the buret dilutes the titrant, resulting in a smaller measured volume of \(\text{NaOH(aq)}\) delivered to reach the endpoint.
- **B.** The calculated concentration will be too high because residual water in the buret dilutes the titrant, requiring a larger measured volume of \(\text{NaOH(aq)}\) to reach the endpoint.
- **C.** The calculated concentration will be too low because residual water in the buret increases the concentration of the \(\text{NaOH(aq)}\) solution, requiring a smaller measured volume of titrant.
- **D.** The calculated concentration will be unaffected because residual water in the buret does not alter the initial number of moles of \(\text{HA(aq)}\) in the Erlenmeyer flask.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119865/*