An aqueous solution of calcium hydroxide is standardized by titration with a 0.112 M solution of hydrobromic acid. If 15.2 mL of base are required to neutralize 12.4 mL of the acid, what is the molarity of the calcium hydroxide solution?

0.0457 M

Explanation:

The reaction that takes place is:

First we calculate how many moles of acid reacted, using the HBr solution's concentration and volume:

Now we convert HBr moles to Ca(OH)₂ moles, using the stoichiometric ratio:

Finally we calculate the molarity of the Ca(OH)₂ solution, using the given volume and calculated moles:

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