A student carries out a titration to find the volume of dilute hydrochloric acid needed to neutralise 25.0 cm3\mathrm{cm^{3}}cm3 of sodium hydroxide solution.
Name the piece of apparatus used to measure exactly 25.0 cm3\mathrm{cm^{3}}cm3 of sodium hydroxide solution into a conical flask.
Name the piece of apparatus used to add the acid slowly and measure its volume.
The student adds a few drops of phenolphthalein indicator to the sodium hydroxide solution.
Give the colour of phenolphthalein in the sodium hydroxide solution.
Give the colour of phenolphthalein at the end point of the titration.
Give one reason why the conical flask is placed on a white tile.
The table shows the student's burette readings.
| Burette reading | Volume / cm3\mathrm{cm^{3}}cm3 |
|---|---|
| final reading | 24.60 |
| initial reading | 0.50 |
Calculate the volume of acid added.
Explain why universal indicator is not used in a titration.
51 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.