1a1 mark
This question is about dissolving different compounds.
Which of these compounds is the most soluble in water?
| ☐ | A | barium sulfate | |
| ☐ | B | calcium sulfate | |
| ☐ | C | magnesium sulfate | |
| ☐ | D | strontium sulfate |
1b1 mark
What is the value, in kJ mol−1, for the standard enthalpy change of solution of magnesium chloride?
| Lattice energy MgCl2 (s) | = −2526 kJmol−1 |
| Hydration enthalpy of Cl− (g) | = − 381 kJmol−1 |
| Hydration enthalpy of Mg2+ (g) | = −1921 kJmol−1 |
| ☐ | A | +157 | |
| ☐ | B | −157 | |
| ☐ | C | +224 | |
| ☐ | D | −224 |
1c6 marks
The solubility of two compounds in different solvents was investigated.
A summary of the findings is shown.
| Compound | Soluble in water | Soluble in hexane |
| 2-methylpentane |  |
✓ |
| potassium bromide | ✓ | |
Explain the findings of the investigation by considering the interactions between the compounds and each of the solvents.
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