An analytical chemist added 1859 mg1859\text{ mg}1859 mg of hydrated sodium carbonate (Na2CO3⋅xH2O\text{Na}_2\text{CO}_3 \cdot x\text{H}_2\text{O}Na2CO3⋅xH2O) to 150 cm3150\text{ cm}^3150 cm3 of 0.200 mol dm−30.200\text{ mol dm}^{-3}0.200 mol dm−3 hydrochloric acid in a reaction vessel and stirred until the reaction was complete.
The resulting mixture was transferred quantitatively to a volumetric flask and made up to 250 cm3250\text{ cm}^3250 cm3 with distilled water.
Portions of 25.0 cm325.0\text{ cm}^325.0 cm3 of this solution were titrated against 0.100 mol dm−30.100\text{ mol dm}^{-3}0.100 mol dm−3 aqueous sodium hydroxide. The average titre required for neutralisation was 17.00 cm317.00\text{ cm}^317.00 cm3.
Calculate the value of xxx in Na2CO3⋅xH2O\text{Na}_2\text{CO}_3 \cdot x\text{H}_2\text{O}Na2CO3⋅xH2O.
Show your working.
Give your answer as an integer.
79 exam-style questions on AQA A Level Chemistry Amount of substance, covering Relative atomic mass and relative molecular mass, The mole and the Avogadro constant, The ideal gas equation, Empirical and molecular formula, and Balanced equations and associated calculations. Each one has a worked solution and a mark scheme showing where the marks go.