31. Solving a chemistry problem

31. Solving a chemistry problem

2. A 200 ml volumetric flask contains a mixture of NaH2PO4 and Na2HPO4. The titration of 15 ml of solution in the presence of phenolphthalein required 10.30 ml of NaOH solution (NNaOH = 0.09855), in the presence of methyl orange - 13.70 ml of HCl solution (NHCl = 0.1175). Calculate the masses of NaH2PO4 and Na2HPO4 in the original solution.

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