Hydrogen reacts with chlorine to form hydrogen chloride.
H2+Cl2→2HCl\mathrm{H_{2} + Cl_{2} \rightarrow 2HCl}H2+Cl2→2HCl
0.30 dm30.30\,\mathrm{dm^{3}}0.30dm3 of hydrogen, measured at room temperature and pressure, reacts completely with excess chlorine. All of the hydrogen chloride formed is dissolved in water and the solution is made up to 250 cm3250\,\mathrm{cm^{3}}250cm3.
What is the concentration of the hydrochloric acid formed?
(1 mol of any gas occupies 24 dm324\,\mathrm{dm^{3}}24dm3 at room temperature and pressure)
1.00×10−4 mol dm−31.00\times10^{-4}\,\mathrm{mol\,dm^{-3}}1.00×10−4moldm−3
0.0250 mol dm−30.0250\,\mathrm{mol\,dm^{-3}}0.0250moldm−3
0.0500 mol dm−30.0500\,\mathrm{mol\,dm^{-3}}0.0500moldm−3
0.100 mol dm−30.100\,\mathrm{mol\,dm^{-3}}0.100moldm−3
106 exam-style questions on Edexcel GCSE Chemistry 7.2 Group 7, covering 7.2.1 Physical properties of the halogens, 7.2.2 Reactions of the halogens, 7.2.3 Relative reactivity and displacement reactions of the halogens, and 7.2.4 Halogen displacement as a redox reaction. Each one has a worked solution and a mark scheme showing where the marks go.