Question detail
Describe the trend in solubility of Group 2 sulfates as you move down the group.
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At a glance
Question
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exam_style
Style
Topic
Group 2, the alkaline earth metals
Question
Describe the trend in solubility of Group 2 sulfates as you move down the group.
Answer
The solubility of Group 2 sulfates decreases down the group. For example, barium sulfate is insoluble, while magnesium sulfate is soluble. This trend is due to the increasing lattice enthalpy outweighing the hydration enthalpy.
Explanation
This answer is strong as it provides specific examples and explains the underlying reasons for the trend in solubility of Group 2 sulfates. It tests the ability to connect solubility with lattice and hydration enthalpies.
Common mistake
Solubility Confusion
Students often confuse the solubility trends of Group 2 hydroxides and sulfates, incorrectly stating that both become less soluble down the group.
To correct this, remember that Group 2 hydroxides increase in solubility down the group, while sulfates decrease in solubility. For example, barium hydroxide is more soluble than magnesium hydroxide, but barium sulfate is less soluble than magnesium sulfate. This can be summarized as follows: - Hydroxides: - Rule: Solubility increases down the group. - Example: Mg(OH)₂ (sparingly soluble) < Ca(OH)₂ (more soluble) < Ba(OH)₂ (most soluble). - Sulfates: - Rule: Solubility decreases down the group. - Example: MgSO₄ (soluble) > CaSO₄ (less soluble) > BaSO₄ (insoluble).
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