An environmental chemist is monitoring the alkaline run-off from a construction site. They titrate a 25.0 cm325.0\text{ cm}^325.0 cm3 sample of wastewater containing barium hydroxide (Ba(OH)2\text{Ba(OH)}_2Ba(OH)2) against a standard solution of 0.125 mol/dm30.125\text{ mol/dm}^30.125 mol/dm3 hydrochloric acid (HCl\text{HCl}HCl).
They find that exactly 22.4 cm322.4\text{ cm}^322.4 cm3 of the hydrochloric acid is required to completely neutralise the barium hydroxide.
The equation for the reaction is:
Ba(OH)2+2HCl→BaCl2+2H2O\text{Ba(OH)}_2 + 2\text{HCl} \rightarrow \text{BaCl}_2 + 2\text{H}_2\text{O}Ba(OH)2+2HCl→BaCl2+2H2O
Calculate the concentration of the barium hydroxide solution in mol/dm3\text{mol/dm}^3mol/dm3 and in g/dm3\text{g/dm}^3g/dm3.
Relative atomic masses (ArA_rAr): H=1\text{H} = 1H=1, O=16\text{O} = 16O=16, Ba=137\text{Ba} = 137Ba=137
Practise AQA GCSE Chemistry Reactions of acids with exam-style questions for Foundation and Higher tier. 43 questions covering Reactions of acids with metals, Neutralisation of acids and salt production, Soluble salts, The pH scale and neutralisation, Titrations (chemistry only), and Strong and weak acids (HT only), matched to the AQA GCSE Chemistry (8462) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.