25 mL of Ca(OH)2 is titrated with 17.8 mL of 0.1 M HCl. What is the concentration of Ca(OH)2?

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zachputnam18 zachputnam18

23-05-2017
Chemistry

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25 mL of Ca(OH)2 is titrated with 17.8 mL of 0.1 M HCl. What is the concentration of Ca(OH)2?

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Аноним Аноним · Answer 1 · 2017-06-06T10:55:17+02:00

To determine the concentration of the calcium hydroxide, we need to relate the acid used by using the chemical reaction involved. The chemical reaction would be

Ca(OH)2 + 2HCl = CaCl2 + 2H2O

We calculate as follows:

Mole HCl = 0.1 M (.0178 L) = 1.78x10^-3 mol HCl
Mole Ca(OH)2 reacted = 1.78x10^-3 mol HCl ( 1 mol Ca(OH)2 / 2 mol HCl ) = 8.4x10^-4 mol

Conc'n Ca(OH)2 = 8.4x10^-4 mol / .025 L = 0.04 M