A solution of calcium chloride (Mr=111.0M_{\text{r}} = 111.0Mr=111.0) contains 1.39 g of CaCl2\text{CaCl}_2CaCl2 in 200 cm3 of solution. In this solution, the calcium chloride is fully dissociated into ions.
What is the concentration of chloride ions in this solution?
1.25×10−2 mol dm−31.25 \times 10^{-2}\text{ mol dm}^{-3}1.25×10−2 mol dm−3
2.50×10−2 mol dm−32.50 \times 10^{-2}\text{ mol dm}^{-3}2.50×10−2 mol dm−3
6.26×10−2 mol dm−36.26 \times 10^{-2}\text{ mol dm}^{-3}6.26×10−2 mol dm−3
1.25×10−1 mol dm−31.25 \times 10^{-1}\text{ mol dm}^{-3}1.25×10−1 mol dm−3
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.