Question

10gm CaCO3 was strongly heated and CO2 liberated was absorbed in 1000 ml of 0.5M NaOH. Assuming
90% purity of CaCO3. How much solution of 0.5 M HCl in ml would be required to react with the solution of the alkali to reach phenolphthalein end point?
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Answer 1

Answer:

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