A student neutralises barium hydroxide with dilute hydrochloric acid in a titration experiment.
Look at the student's method for her experiment.
Describe and explain one improvement the student should make to her method to get a more accurate titration result.
The student repeats the experiment four times.
Look at the student's results.
| Titration number | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| Volume of acid (cm3\text{cm}^3cm3) | 27.20 | 25.05 | 24.95 | 25.00 |
Calculate the accurate volume of the acid that reacts with the alkali.
Look at the equation for the reaction between hydrochloric acid and barium hydroxide.
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+2H2OUse your answer from part (b)(i) to calculate the concentration of the dilute hydrochloric acid, HCl\text{HCl}HCl, that reacted with the 20.0 cm320.0\text{ cm}^320.0 cm3 of 0.0500 mol/dm30.0500\text{ mol/dm}^30.0500 mol/dm3 barium hydroxide.
Give your answer to 3 significant figures.
91 exam-style questions on OCR GCSE Chemistry Monitoring chemical reactions. Each one has a worked solution and a mark scheme showing where the marks go.