A 25.0 ml volume of 0.010 m k10 containing excess of k1 is added to = 0.246 g sa

Question

A 25.0 ml volume of 0.010 m k10 containing excess of k1 is added to = 0.246 g sample of a real so fusion containing vitamin c the yellow browse solution caused by the of excess is to a colorless how many movies of k10 added were added to the real lemon solution? calculate the moles of i_2 that are serenaded from the k10_3? how many moles of i_2 with the 0.100 m na_2s_2o_3 in the titration? calculate the moles and grams of vitamin c c_6h_8O_2 in the sample? calculate the percent (by mass) of vitamin c in the real lemon sample.

Explanation / Answer

5. For Vit-C analysis in sample,

a. moles of KIO3 present = 0.01 M x 25 ml = 0.25 mmol

b. moles of I2 formed from KIO3 = 0.25 mmol x 3 = 0.75 mmol

c. moles of I2 reacted with Na2S2O3 = 0.1 M x 10.7 ml/2 = 0.535 mmol

d. moles of I2 reacted with vitamin C = 0.750 - 0.535 = 0.215 mmol

e. moles of Vit-C in sample = 0.215 mmol

grams of Vit-C in sample = 0.215 mmol x 176.12 g/mol/1000 = 0.04 g

f. %mass Vit-C in sample = 0.04 x 100/0.246 = 16.26%

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