# Chemistry Lab Report for Vitamin C Estimation by Back(Idiometric) Titration

3329 Words Mar 12th, 2013 14 Pages
Vitamin c Estimation by back(idiometric) titration Mahindra (UWC of India) Chemistry lab report for back titration Name: Ashenafi Asfaw Beyene

Back (Indirect) Titration
Vitamin C estimation by Back Titration

Table1: The amount of volume (in cm3) and concentration (in M) of KI, KIO3, and H2SO4 which were used in the experiment of Vit C estimation by back titration.
VKI added to the solution/cm3 Concentration of KI added to the solution/M Volume of KIO3 added to the flasks ±0.08/cm3 Volume of H2SO4 added to the solution±0.08/ cm3 Concentration of H2SO4 added to the solution/M
15.0
This is equal to the mole of ascorbic acid in 10cm3.
So the total moles of ascorbic acid in 100cm3 solution = 1.42X 10-3 mol±0.7mol
Mass of ascorbic acid = 176 *(1.42X 10-3 mol) = 0.249 g ±1g

Mass of ascorbic acid=0.249±1/g
Calculation for percentage yield in ascorbic acid
Theoretical mass for ascorbic acid is given as
Each tablet contains 0.10mg there for 3 tablets contains 0.30g

%yield=(experimental mass/theoretical mass) X100 %=( 0.249g/0.30g)x100%=83%
Therefore %yield in ascorbic acid is 83%

Error Propagation in mole of ascorbic acid

%error in mole of ascorbic acid for part