The table shows how four solutions are made.
| Solution | Solute | Mass of solute (g) | Volume of solution (cm3\mathrm{cm^{3}}cm3) |
|---|---|---|---|
| A | sodium hydroxide, NaOH | 4.00 | 250 |
| B | sodium chloride, NaCl | 5.85 | 200 |
| C | sodium carbonate, Na2CO3\mathrm{Na_{2}CO_{3}}Na2CO3 | 21.2 | 500 |
| D | sodium hydroxide, NaOH | 3.00 | 125 |
Relative formula mass (MrM_rMr): NaOH = 40.0 NaCl = 58.5 Na2CO3\mathrm{Na_{2}CO_{3}}Na2CO3 = 106.0
Which solution has the highest concentration in mol/dm3\mathrm{mol/dm^{3}}mol/dm3?
Solution A
Solution B
Solution C
Solution D
57 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.