(a) A sample of solid Ca(OH) 2 is stirred in waterat 30 degree C until the solut

Question

(a) A sample of solid Ca(OH)2 is stirred in waterat 30 degree C until the solution contains as much dissolvedCa(OH)2 as it can hold. A 100.-mL sample of thissolution is withdrawn and titrated with 5.00 x 10-2 MHBr. It requires 48.8 mL of the acid solution forneutralization. What is the molarity of the Ca(OH)2solution? _____ M (b) What is the solubility of Ca(OH)2 in water, at30 degree C, in grams of Ca(OH)2 per 100 mL ofsolution? _____ g (a) A sample of solid Ca(OH)2 is stirred in waterat 30 degree C until the solution contains as much dissolvedCa(OH)2 as it can hold. A 100.-mL sample of thissolution is withdrawn and titrated with 5.00 x 10-2 MHBr. It requires 48.8 mL of the acid solution forneutralization. What is the molarity of the Ca(OH)2solution? _____ M (b) What is the solubility of Ca(OH)2 in water, at30 degree C, in grams of Ca(OH)2 per 100 mL ofsolution? _____ g

Explanation / Answer

a) moles of HBr = molarity x volume = 0.05x 0.0488 = 0.00244 mol moles of Ca(OH)2 = (1/2) x moles of HBr=(1/2) x 0.00244 = 0.00122 mol molarity of Ca(OH)2 = moles / volume =0.00122 mol / 100 mL = 0.00122 mol / 0.1 L = 0.0122mol/L
b) MW of Ca(OH)2 = 74.09g/mol mass of Ca(OH)2 = moles of Ca(OH)2 x MWof Ca(OH)2 = 0.00122 x 74.09 = 0.09 g

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