| Solubility |
| Solubility of salts at various temperatures |
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Design experiments in the virtual lab to answer the follow questions.
1). You may have noticed that you can dissolve more sugar or table salt in hot water than in cold water. This is because the solubility of these substances increases with temperature. But is it always true that solubility increases with temperature? The stockroom contains the solids KCl and Ce2(SO4)3. Does the solubility increase with temperature for these substances? 2a). When you dissolve KCl in water, does the reaction give off heat or absorb heat? Is the dissolution of KCl in water endothermic or exothermic? 2b). When you dissolve Ce2(SO4)3 in water, does the reaction give off heat or absorb heat? Is the dissolution of Ce2(SO4)3 in water endothermic or exothermic? 3). Based on your observations from questions 1 and 2, can you hypothesize a relationship between the endo/exothermicity of a reaction and the dependence of the solubility on temperature? Can you support your hypothesis with a well-known chemical principle? |