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in a sodium carbonate/bicarbonate analysis, a 0.4057g sample required 15.65mL of 0.1690 MHCl solution to reach...

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Chemistry

in a sodium carbonate/bicarbonate analysis, a 0.4057g samplerequired 15.65mL of 0.1690 MHCl solution to reach thephenolphtalein end point and a total of 40.30mL to achievve thebromocresol green endpoint. Determine wt % NaHCO3 and Na2CO3 inthis sample. Fromula weights of NaHCO3 and NA2CO3 are 84.0 and106.0g/mol.

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The analysis is of NaHCO3 and Na2CO3 We need to remember that The reaction of the two bases with acid will be CO32 H HCO3 1 HCO3 H H2CO3 1 The phenolphthalein end point indicates complete reaction of carbonate with acid to give bicarbonate 1 2 bromocresol green end point    See Answer
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