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A solution is made by dissolving 8.65 g sample of an unknown group 2A metal hydroxide,...

A solution is made by dissolving 8.65 g sample of an unknown group 2A metal hydroxide, M(OH)2 , in enough water to prepare 85.0 mL of solution. the unknown base reacts with hydrochloric acid according to the reaction show below.

M(OH)2 (aq) +2HCl (aq) = MCl2 (aq) _ 2H2O (l)

Titration of this solution required 56.9 mL of 2.50 M HCl (aq) solution to reach equivalence point.

1. What is the molar mass of the metal hydroxide?

2. What is the identity of the metal cation: Ca2+ or Sr2+ or Ba2+

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