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In a sodium carbonate/ bicarbonate analysis a 0.4057g sample required 15.65 ml of 0.1690M HCL solution...

In a sodium carbonate/ bicarbonate analysis a 0.4057g sample required 15.65 ml of 0.1690M HCL solution to reach the phenophthalein end point and a total of 40.30ml to achieve the bromocresol green endpoint. detemine the wt% NaHCO3 anf Na2CO3 in this sample. formula weights of NaHCO3 and Na2CO3, respectively are 84.0 and 106.0g/mol

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