how your calculations for Trial 1 below. Molarity of standardized KIO, solution_
ID: 717676 • Letter: H
Question
how your calculations for Trial 1 below. Molarity of standardized KIO, solution_0.Ol COmo/L Trial Sample size, mL Final buret reading, mL 23.00 32.81 12.20 42.l Initial buret reading, m Total volume KIO, mL 1O. 3587.31 .s Moles KIO, mol Tlo les Vitamin C, mol m fHt2fft 42km Grams Vitamin C, g mg Vitamin C, mg Average mg of Vitamin C, mg Based on your average mass of Vitamin C in 25 mL of solution, how many milligrams of Vitamin 5.00 2,005,00 2S.0o .0 32.8 37.3S C would there be in 500 mL of solution? (Show your work) Compare your results above with the amount of Vitamin C in one packet of Emergen-C, which i mg. If your results vary, list some possible reasons for the difference.Explanation / Answer
molarity of standardised KIO3=0.0100
principle involved: vitamin C contains ascorbic acid(C6H8O6)
reaction between ascorbic acid and potassium Iodate and ascorbic acid as fallows
KIO3 + 5KI + 6H+ 3I2 + 6K+ + 3H2O
C6H8O6 + I2 C6H6O6 + 2I- + 2H+
Based one above equations we can infer that one mole of ascorbic acid requires one mole of iodine, similarly one mole of iodine can be formed from 1/3 mole of KIO3
So totally one mole of ascorbic acid requires 1/3 mole of KIO3
ONE MOLE OF KIO3 = 3 MOLES OF VITAMIN C
MASS OF VITAMIN C = 176 X no of moles of ascorbic acid
trail
1
2
3
4
Sample size
25
25
25
25
Final burette reading
23
32.89
42.20
42.01
Initial burette reading
12.65
23
32.89
32.35
Toal volume of KIO3,ml
10.35
9.89
9.31
9.44
Moles of KIO3
0.0001035
0.0000989
0.0000931
0.0000944
Moles of vitamin C
3X0.0001035=0.0003105
3X0.0000989=0.0002967
3X0.0000931=0.0002793
3X0.0000944=0.0002832
Grams of vitamin C
0.054648
0.0522192
0.0491568
0.0498432
Mg of vitamin C
54.648
52.2192
49.1568
49.8432
trail
1
2
3
4
Sample size
25
25
25
25
Final burette reading
23
32.89
42.20
42.01
Initial burette reading
12.65
23
32.89
32.35
Toal volume of KIO3,ml
10.35
9.89
9.31
9.44
Moles of KIO3
0.0001035
0.0000989
0.0000931
0.0000944
Moles of vitamin C
3X0.0001035=0.0003105
3X0.0000989=0.0002967
3X0.0000931=0.0002793
3X0.0000944=0.0002832
Grams of vitamin C
0.054648
0.0522192
0.0491568
0.0498432
Mg of vitamin C
54.648
52.2192
49.1568
49.8432
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