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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.

Answer & Explanation Solved by verified expert
4.0 Ratings (581 Votes)
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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