Question detail
Explain the trend in solubility of Group 2 hydroxides. What is the reason for this trend?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Group 2, the alkaline earth metals
Question
- A. Solubility decreases due to increased lattice energy
- B. Solubility increases due to decreased lattice energy
- C. Solubility remains constant due to similar ionic sizes
- D. Solubility varies due to temperature changes
Answer
Solubility increases due to decreased lattice energy
Explanation
The solubility of Group 2 hydroxides increases down the group because the lattice energy decreases, making it easier for the hydroxides to dissolve in water.
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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