3) A weighed portion of the test sample, which may contain one of the substances: NaOH, Na2CO3, NaHCO3 or one of the mixtures: NaOH Na2CO3, Na2CO3 NaHCO3, was dissolved in water and titrated with an HCl solution with phenolphthalein and methyl orange indicators applied sequentially. Determine which substance or mixture is being titrated and calculate the percentage of the analyte or components in the mixture.
Substance weight = 0.2230 g
HCl concentration = 0.1032 Cn
The volume of nitric acid for phenolphthalein = 28.10 cm3
Volume of nitric acid by methyl orange = -
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