Consider an impure sample of 25.20% Na2CO3.  How many grams of the sample must be dissolved in a 500-mL solution so that titration of a 50-mL aliquot portion will require only about 22.0 mL of 0.1250 M HCl to reach the methyl orange end point?  MM Na2CO3 = 105.99 MM HCl = 36.46 Below is the balance chemical equation for the titration of sodium carbonate with hydrochloric acid.

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