86.66 % by weight of ascorbic acid in the tablet, when 0. 1220 g vitamin c tablet was dissolved in acid. This required 11. 50 ml of 0. 01740 m [tex]KIO_3[/tex] to reach the endpoint.
A balanced chemical reaction is an equation that has equal numbers of each type of atom on both sides of the arrow.
[tex]3C_6H_80_6 +3I_2 +KIO_3 +5KI +6H^+[/tex] → [tex]3C_6H_60_6 +6I^- +3I_2+6K^+ +3H_2O[/tex]
So, the balanced chemical equation for the reaction will be:
[tex]3C_6H_8O_6 +KIO_3[/tex] → [tex]3C_6H_6O_6 +KI + 3H_2O[/tex]
That means, 3 mol of of ascorbic acid reacts with 1 mol of [tex]KIO_3[/tex]
Moles of [tex]KIO_3[/tex] available is 0.0174 X 0.0115 =0.0002001 mol
Moles of ascorbic acid to be yielded should be 3 X 0.0002001 =0.0006003
So, percent mass of ascorbic acid in the tablet will be:
(0.1057 / 0.1220) X 100 %
=86.66 %
Hence, the third option is the correct answer.
Learn more about balanced chemical equations here:
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