A 11.00 gram sample of Vodka was analysed for its alcohol content. The sample was placed in a300 mL volumetric flask and made to the mark with distilled water. A 20.0 mL aliquot of the dilutedVodka was taken from the volumetric flask and placed in a conical flask containing some distilled water from a previous washing.The 20.0 mL aliquots were titrated against a 0.1302 M Cr2O72-solution and an average titre of13.25 mL was obtained.The reaction between the alcohol and the dichromate solution is given below2Cr2O72–(aq) + 3CH3CH2OH(aq) + 16H+(aq) 4Cr3+(aq) + 3CH3COOH(aq) + 11H2O(l)a) Calculate the amount in mol of Cr2O72– in the average titre. b) Calculate the percentage, by mass, of ethanol in the vodka.
A 11.00 gram sample of Vodka was analysed for its alcohol content. The sample was placed in a
300 mL volumetric flask and made to the mark with distilled water. A 20.0 mL aliquot of the diluted
Vodka was taken from the volumetric flask and placed in a conical flask containing some distilled water from a previous washing.
The 20.0 mL aliquots were titrated against a 0.1302 M Cr2O72-solution and an average titre of13.25 mL was obtained.
The reaction between the alcohol and the dichromate solution is given below
2Cr2O72–(aq) + 3CH3CH2OH(aq) + 16H+(aq) 4Cr3+(aq) + 3CH3COOH(aq) + 11H2O(l)
a) Calculate the amount in mol of Cr2O72– in the average titre.
b) Calculate the percentage, by mass, of ethanol in the vodka.
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