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A 0.4400-g sample of impure Ca(OH)2 is dissolved inenough water to make 43.90 mL of solution. 20.00 mL of theresulting solution is then titrated with 0.2554-M HCl. What is thepercent purity of the calcium hydroxide if the titration requires18.64 mL of the acid to reach the endpoint?

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