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Hydrates

Hydrates. A hydrate is an ionic compound (usually crystalline) that has water molecules in its solid structure. EX: CaSO 4 •2H 2 0 calcium chloride dihydrate. Working with Hydrates. Anhydrous compound = When all the hydrating water is removed by heat( ) Symbol for heat

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Hydrates

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  1. Hydrates • Ahydrate is an ionic compound (usually crystalline) that has water molecules in its solid structure. • EX: CaSO4•2H20 calcium chloridedihydrate

  2. Working with Hydrates • Anhydrous compound = When all the hydrating water is removed by heat( ) Symbol for heat • If the formula of the anhydrouscompoundis known, you can determine the formula of the hydrate. • % composition is based on the amount of water in the hydrate.

  3. Naming Hydrates • There are two parts to naming hydrates: • First, name the ionic compound.(This is the compound on the left side of the dot.) • Next, determine how many water molecules are present. Use the molecular prefixes to indicate the number of water molecules in the hydrate. (prefix-hydrate) • Ex 1) CaCl2•2H20 calcium chloridedihydrate • Ex 2) Na2SO4•6H2O sodium sulfatehexahydrate • Ex 3) MnSO3•H2O manganese (II)sulfite monohydrate

  4. Heating the crystal in a crucible drives off the water then the salt is called anhydrous MnSO4•H2OMnSO4 + H2O

  5. CuCl2•2H2O CuCl2 + 2H2O

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