A 15.00g solid mixture containing Ca (OH) 2, among other non-basic components, was neutralized with 0.2000g of HCl. What was the mass percentage of Ca (OH) 2 in the mixture? Round your answer to four significant figures

Question

Chemistry

Franco

6 December, 16:16

A 15.00g solid mixture containing Ca (OH) 2, among other non-basic components, was neutralized with 0.2000g of HCl. What was the mass percentage of Ca (OH) 2 in the mixture? Round your answer to four significant figures

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Answers (1)

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Brewster · Answer 1

1.373 wt% Ca (OH) ₂

Explanation:

Sample mix = 15.0g

Ca (OH) ₂ (aq) + 2HCl (aq) = > CaCl₂ (aq) + 2H₂O (l)

moles HCl = 0.2000g / 36 g·mol⁻¹ 0.0056 mol

moles Ca (OH) ₂ = 1/2 (moles HCl) = 1/2 (0.0056 mol) = 0.0028 mol

mass Ca (OH) ₂ = 0.0028 mol (74 g/mol) = 0.206 g

mass % Ca (OH) ₂ = (0.206/15.0) 100% = 1.373 wt%