Given equation: 2S 2 O 3 2- + I 2____ > 2I - + S 4 O 6 2- Calcualte the number o

Question

Given equation: 2S2O32- + I2____> 2I- + S4O62-

Calcualte the number of moles of S2O32- consumed in each reaction. Use the stoichiometry in the equation above. In the equation above one-half the moles of S2O32- equals the moles of I2 that form in the reaction. Record the moles of I2 formed during the elapsed time. The elapsed times are 312 seconds, 133 seconds, 86 seconds, 49 seconds, and 33 seconds. could someone please help me, i do not know how to find the moles of S2O32- reacted and the moles of I2 produced.

Explanation / Answer

2S2O32- + I2 ---> 2I- + S4O62-
Let concentration of Iodine solution, cB = 0.06M
volume of iodine solution, vB = 25ml=0.025L
coefficient, nB = 1
Moles of I2 = vB*cB= 0.025*.06 = 0.0015

Concentration of thiosulfate solution, cA = MA
volume of titre at end point of titration, vA
coefficient, nA = 2
Moles of S2O3(2-) consumed = nA*vB*cB=2*.025*.06=0.003

Concentration of thiosulfate, cA = vB*cB*nA/(vA*nB)

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