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What is the formula for magnesium chloride dihydrate? (You may use a * to represent the dot in the formula.)

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Answer is: MgCl₂ · 2H₂O.
Magnesium oxidation number in this compound is +2.
Oxidation number of chlorine is -1 (2 · (-1) = -2). Compound is neutral.
Fihydrate means there are two molecules of water in compound.
This type of salt is crystalhydrate. Water can be removed by heating.
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