Question detail
What is the trend in solubility of Group 2 hydroxides as you move down the group?
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
- B. Solubility increases
- C. Solubility remains constant
- D. Solubility varies randomly
Answer
Solubility increases
Explanation
As you move down Group 2, the solubility of hydroxides increases due to the larger ionic radius, which allows for better hydration of the ions.
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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