Question

titration of the I2 produced from 0.1168g of primary standard KlO3 required 27.17 ml of sodium...

titration of the I2 produced from 0.1168g of primary standard KlO3 required 27.17 ml of sodium thiosulfate

IO3- + fI- +^H ----> 3I2 +3H2O

I2 +2S2O2^2- ----> 2I- + S4O6^2-

calculate the concentration of the Na2S2O3

Homework Answers

Answer #1

Molar mass of KIO3 = 214.001 g/mol

0.1168 gm of KIO3 = 0.1168 / 214 = 5.4579 e-4 Mole

According to equation 1 Mole of KIO3 will produce 3 Moles of I2

5.4579 e-4 Mole of KIO3 will produce 3 x 5.4579 e-4 = 0.00163738 Moles of I2

According to equation 1 Mole of I2 reacts with 2 Moles Na2S2O3

0.00163738 Moles of I2 needs 0.00163738 x 2 = 0.0032747 Moles of Na2S2O3

Volume of Na2S2O3 used = 27.17 ml

Concentration of Na2S2O3 = 0.0032747 x 1000 / 27.17 = 0.1205 M

Concentration of Na2S2O3 = 0.1205 M

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