1gram of a sample of CaCO(3) was strongl...

1gram of a sample of `CaCO_(3)` was strongly heated and the `CO_(2)` liberated was absorbed iun 100mL of 0.5 M NaOH solution. Assuming 90% purity for the sample, how many mL of 0.5M HCl would be required to react with the resulting solution to reach the end point inpresence of phenolphthaein?

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