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 unpredictably
Answer
Solubility increases
Explanation
As you move down Group 2, the solubility of hydroxides increases due to the larger ionic radius and lower lattice energy, which allows for easier dissociation in water.
Common mistake
Misunderstanding Solubility Trends
Students often confuse the solubility trends of Group 2 hydroxides and sulfates, incorrectly stating that both increase or decrease uniformly down the group.
To clarify, remember that the solubility of Group 2 hydroxides increases down the group, while the solubility of sulfates decreases. Use this rule: 'Hydroxides are more soluble as you go down, sulfates are less soluble.'
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