Aqueous Reactions Stoichem

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(a) A sample of solid Ca(OH)2 is stirred in water at 30°C until the solution contains as much dissolved Ca(OH)2 as it can hold. A 100.-mL sample of this solution is withdrawn and titrated with 5.00 ✕ 10−2 M HBr. It requires 48.8 mL of the acid solution for neutralization. What is the molarity of the Ca(OH)2 solution?

(b) What is the solubility of Ca(OH)2 in water, at 30°C, in grams of Ca(OH)2 per 100 mL of solution?

Oct 3rd, 2015

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a)Balanced equation:

Ca(OH)2 +2HBr  → CaBr2 +2H2O

Ma * Va = 2* Mb*Vb

Ma * 100 = 2*0.05* 48.8 

Ma = 2*0.05*48.8/100  Ma = 0.0488 mol Ca(OH)2 per litre

Molarity of Ca(OH)2 solution = 0.0488M

Answer =0.0488M

b)Molar mass Ca(OH)2 = 74.093 g/mol

  0.0488M = 74.093*0.0488 = 3.616g/litre 

  Answer:  Solubility = 0.3616 g per 100ml solution.

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Sep 18th, 2015

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