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How many water molecules of crystallization are present in one formula unit of Epsom salt, magnesium sulphate?
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Answer & Solution
Correct answer: A. Seven
1. Epsom salt is magnesium sulphate heptahydrate, MgSO4.7H2O.
2. The prefix 'hepta' and the formula show 7 water molecules per formula unit.
3. The value 5 belongs to blue vitriol (CuSO4.5H2O) and 2 to gypsum, so those are wrong here.
4. Therefore Epsom salt has seven water molecules of crystallization.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 9 Solutions "Magnesium sulphate heptahydrate", p.137_
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