Citric acid reacts with sodium hydroxide: C6H8O7(aq)+3NaOH(aq)→Na3C6H5O7(aq)+3H2O(l)\mathrm{C_{6}H_{8}O_{7}(aq) + 3NaOH(aq) \rightarrow Na_{3}C_{6}H_{5}O_{7}(aq) + 3H_{2}O(l)}C6H8O7(aq)+3NaOH(aq)→Na3C6H5O7(aq)+3H2O(l)
What volume of 0.120 mol dm−30.120\,\mathrm{mol\,dm^{-3}}0.120moldm−3 sodium hydroxide solution exactly neutralises 20.0 cm320.0\,\mathrm{cm^{3}}20.0cm3 of 0.0500 mol dm−30.0500\,\mathrm{mol\,dm^{-3}}0.0500moldm−3 citric acid solution?
0.0250 cm30.0250\,\mathrm{cm^{3}}0.0250cm3
2.78 cm32.78\,\mathrm{cm^{3}}2.78cm3
8.33 cm38.33\,\mathrm{cm^{3}}8.33cm3
25.0 cm325.0\,\mathrm{cm^{3}}25.0cm3
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.