A mixture of sodium carbonate (Na2CO3) and sodium bicarbonate (NaHCO3) is dissolved in water and titrated with 0.100 M HCl. Methyl orange and phenolphthalein are employed for the titration. Methyl orange changes color from red to yellow between pH 3.1 and 4.4 with increasing pH, while phenolphthalein changes from colorless to red between pH 8.0 and 9.6 with increasing pH. 12.00 mL of HCl is required to reach the phenolphthalein end point in the titration of t
A mixture of sodium carbonate (Na2CO3) and sodium bicarbonate (NaHCO3) is dissolved in water and titrated with 0.100 M HCl. Methyl orange and phenolphthalein are employed for the titration. Methyl orange changes color from red to yellow between pH 3.1 and 4.4 with increasing pH, while phenolphthalein changes from colorless to red between pH 8.0 and 9.6 with increasing pH. 12.00 mL of HCl is required to reach the phenolphthalein end point in the titration of the mixture. The titration of a second aliquot of the mixture requires 34.00 mL of titrant to reach the methyl orange end point.
(i) What is the major species present in the solution at each end point?
(ii) How many millimoles of carbonate and bicarbonate are in the sample?
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