A student uses a pipette to transfer 25.0 cm325.0\,\mathrm{cm^{3}}25.0cm3 of 0.120 mol dm−30.120\,\mathrm{mol\,dm^{-3}}0.120moldm−3 sodium hydroxide solution into a conical flask. The student titrates this solution with dilute sulfuric acid.
The reaction is:
H2SO4(aq)+2NaOH(aq)→Na2SO4(aq)+2H2O(l)\mathrm{H_{2}SO_{4}(aq) + 2NaOH(aq) \rightarrow Na_{2}SO_{4}(aq) + 2H_{2}O(l)}H2SO4(aq)+2NaOH(aq)→Na2SO4(aq)+2H2O(l)
| Titration | Volume of sulfuric acid added / cm3\mathrm{cm^{3}}cm3 |
|---|---|
| Rough | 24.20 |
| 1 | 23.60 |
| 2 | 23.65 |
Calculate the concentration of the sulfuric acid in mol dm−3\mathrm{mol\,dm^{-3}}moldm−3.
151 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.