A technician used a barium hydroxide solution to determine the concentration of a hydrochloric acid solution.
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
The technician titrated 25.0 cm3 samples of the hydrochloric acid with 0.120 mol/dm3 barium hydroxide solution.
| Titration | Volume of barium hydroxide solution used in cm3\text{cm}^3cm3 |
|---|---|
| 1 | 18.60 |
| 2 | 18.65 |
| 3 | 19.40 |
The relative formula mass, MrM_rMr, of HCl is 36.5.
Use the two volumes that are closest together.
Calculate the concentration of the hydrochloric acid solution in g/dm3\text{g/dm}^3g/dm3.
106 exam-style questions on AQA GCSE Chemistry 3.4 Using concentrations of solutions in mol/dm3, covering 3.4.1 Concentration in mol/dm3. Each one has a worked solution and a mark scheme showing where the marks go.