The Titration of 15 mL of Hydrobromic acid required 22.96 mL of a 0.1853 M calcium hydroxide for endpoint. Calculate concentration of Hydrobromic acid. 2HBr(aq) + Ca(OH)2 (aq) = CaBr2(aq) + 2H2O (l)

Answer 1

Find the moles of HBr as follows—

22.96 mL Ca(OH)2 x 1 L x 0.1853 moles Ca(OH)2 x 2 moles HBr = 0.008509 moles HBr

1000 mL 1 L 1 mole Ca(OH)2

Divide moles HBr by Liters HBr to get the molarity of HBr. [M= Moles/L]

0.008509 mols HBr = 0.57 M

0.015 L HBr