The task of analytical chemistry 59

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The solution contains one or more of the following compounds: Na2CO3, NaHCO3, NaOH. In the titration of 50.0 ml of solution in presence of phenolphthalein spent 22,1 ml 0,100 n HC1. The second portion of the solution with a volume of 50.0 ml was gottitravel in the presence of bromocresol green, and near the second equivalence point the solution was boiled to remove CO2. In the titration went 48,4 ml of HCl. What is the composition of the initial solution?

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