Mathematics
trulybrad
11

If 20.0 mL of Ca(OH)2 with an unknown concentration is neutralized by 37.5 mL of 0.124 M HCl, what is the concentration of the Ca(OH)2 solution? Show all of the work needed to solve this problem. Ca(OH)2 + 2 HCl 2 H2 O + CaCl2

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(1) Answers
Peanut2

The balanced chemical reaction is: Ca(OH)2 + 2 HCl = 2 H2 O + CaCl2 We are given the amount of hydrochloric acid to be used in the reaction. This will be the starting point for the calculations. 0.124 mol HCl / L soln ( .0375 L solution) ( 1 mol Ca(OH)2 / 2 mol HCl) / 0.020 L Ca(OH)2 solution = 0.12 mol / L Ca(OH)2 = 0.12 M

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