Magnesium hydroxide is classified as which in water?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Magnesium hydroxide is classified as which in water?

Explanation:
Solubility in water is the idea being tested. Magnesium hydroxide dissolves only very slightly in water, so it isn’t considered soluble. Most of it stays as a solid, which is why you often see a cloudy suspension called milk of magnesia rather than a clear solution. It doesn’t react with water under ordinary conditions, and it only decomposes when heated, not just in water. So the best description is insoluble in water.

Solubility in water is the idea being tested. Magnesium hydroxide dissolves only very slightly in water, so it isn’t considered soluble. Most of it stays as a solid, which is why you often see a cloudy suspension called milk of magnesia rather than a clear solution. It doesn’t react with water under ordinary conditions, and it only decomposes when heated, not just in water. So the best description is insoluble in water.

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