50 gm of a sample of Ca(OH)(2) is dissol...

50 gm of a sample of `Ca(OH)_(2)` is dissolved in 50 ml of 0.5 N HCl solution. The excess of HCl was titrated with 0.3N NaOH. The volume of NaOH used was 20cc. Calculate % purity of `Ca(OH)_(2)`.

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