A sample of 25.0 mL of 0.120 M Ca(OH)2(aq) is titrated with 0.150 M HCl(aq). What volume of HCl(aq) is needed to completely neutralize the Ca(OH)2(aq)

Explanation:

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In this case, since the reaction between calcium hydroxide and hydrochloric acid shows a 2:1 mole ratio between them:

We need to use the following mole ratio:

That can be written in volumes and concentrations:

Thus, we solve for the volume of HCl as it is the unknown:

Therefore, we plug in to obtain:

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