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Question

50 g of a sample of Ca(OH)2 is dissoved in 50 mL of 0.5 N HCl solution. The excess of HCl was titrated with 0.3 N NaOH. The volume of NaOH used was 20 cc. The percentage purity of Ca(OH)2 is:

A
1.406%
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B
5.406%
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C
1.506%
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D
1.45%
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Solution

The correct option is C 1.406%
Meq. of Ca(OH)2= Meq. of HCl
⎜ ⎜ ⎜w742⎟ ⎟ ⎟×1000=(50×0.50.3×20) w=0.703
Percentage of Ca(OH)2=w50×100=0.70350×100=1.406%

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