Worksheet: Water of Crystallization

In this worksheet, we will practice defining water of crystallization and explaining its effect on the structures, stabilities, and properties of crystals.

Q1:

How many molecules of water are there per unit of aluminum hydroxide in A l ( O H ) · 3 H O 3 2 ?

Q2:

A sample of magnesium sulfate hydrate ( M g S O · H O ) 4 2 𝑥 is heated until its mass remains constant. For every mole of M g S O 4 , 7 moles of water are liberated. What is the value of 𝑥 ?

Q3:

A sample of cobalt(II) chloride hydrate ( C o C l · H O ) 2 2 𝑥 is heated until its mass remains constant. For every 1.00 g of cobalt(II) chloride produced, 0.831 g of water is liberated. What is the value of 𝑥 , where 𝑥 is an integer?

Q4:

Copper(II) sulfate hydrate has the molecular formula C u S O · H O 4 2 𝑥 , where 𝑥 is a whole number. A 3.13 g sample of this compound is heated until its mass remains constant at 2.00 g. Calculate the value of 𝑥 .

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