A student performs a titration to determine the concentration of a sodium hydroxide solution. A pipette is used to measure 25.0 cm3 of the sodium hydroxide solution into a conical flask. The solution is then titrated against standard hydrochloric acid delivered from a burette.
Before the titration is carried out, the student rinses both the burette and the conical flask with distilled water.
Explain the effect, if any, that traces of distilled water left in:
the burette after rinsing would have on the volume of hydrochloric acid required to reach the end-point.
the conical flask after rinsing would have on the volume of hydrochloric acid required to reach the end-point.
157 exam-style questions on Edexcel GCSE Chemistry 6.2 Quantitative analysis, covering 6.2.1 Concentration in mol dm⁻³ and titration calculations, 6.2.2 Percentage yield and why actual yield falls short, 6.2.3 Atom economy of a reaction, 6.2.4 Choosing a reaction pathway, and 6.2.5 Molar volume of gases and Avogadro's law. Each one has a worked solution and a mark scheme showing where the marks go.