Question

A sample, supposed to be pure CaCO3, is used to standardize a solution of HCl. The substance was actually a mixture of MgCO3 and BaCO3, but the standardization was correct in spite of erroneous assumption. The percentage of MgCO3 (by mass) in the mixture would be?
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Answer 1

first find out the mass of caco3..then u can further answer