Question detail
How does the solubility of Group 2 hydroxides change 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 down the group.
- B. Solubility remains constant down the group.
- C. Solubility increases down the group.
- D. Solubility varies randomly without a clear trend.
Answer
Solubility increases down the group.
Explanation
The cause is the increasing atomic size and decreasing charge density of Group 2 metals as you move down the group. This leads to weaker ionic bonds in the hydroxides. The mechanism is that larger metal ions result in a greater distance between the ions in the lattice, making it easier for water molecules to separate them. The effect is that hydroxides become more soluble in water. Consequently, this trend allows for more effective use of these compounds in various applications.
Common mistake
Misunderstanding Barium Sulfate's Safety
Students often believe that barium sulfate is safe to use in medicine because it is a barium compound, overlooking its toxicity.
Barium sulfate is used in medicine because it is insoluble in water, preventing it from being absorbed into the bloodstream, thus minimizing toxicity while allowing it to be used as a contrast agent in medical imaging.
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