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Cu(II) sulfate exists as a hydrate. It has many practical uses including use as a fungicide...

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Chemistry

Cu(II) sulfate exists as a hydrate. It has many practical usesincluding use as a fungicide and pesticide. When mixed withchromium and arsenic it forms the wood preservative called CCA. CCAwas used in pressure treated wood to protect wood from rotting dueto insects and microbial agents. Because CCA-treated wood containstoxic heavy metals, its use has been discontinued for home use andchildren’s play sets.

A chemist is given a sample of the CuSO4 hydrate andasked to determine the empirical formula of it. The original sampleweighed 42.75 g. After heating to remove the waters of hydration,the sample weighed 27.38 g. Determine the formula for thishydrate.

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Answer & Explanation Solved by verified expert
4.2 Ratings (577 Votes)

sampla mass = 42.75 g

after heating mass = 27.38 g

mass of water driven off = 42.75 -27.38

                                       = 15.37 g

moles of water = 15.37 / molar mass of water

                        = 15.37 / 18

                        = 0.854

moles of Cu(II) sulfate = 27.38 / 159.6

                                    = 0.172

by divide smallest whole number

CuSO4 = 0.172 / 0.172 = 1

H2O = 0.854 / 0.172 = 4.965 (nearly 5)

so

formula of hydrate : CuSO4 .5H2O
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