Analytical Chemistry
1.0kg of seaweed produces sufficient iodine to react with 100 cm3 of 0.100M sodium thiosulfate solution. Calculate the mass of iodine extracted from 1.0kg of seaweed.
Appreciate help here, thanks!
Appreciate help here, thanks!
Simple stoichiometry. Start with the reaction equation.
Hint: http://www.titrations.info/iodometric-titration
Hint: http://www.titrations.info/iodometric-titration
Original post by Borek
Simple stoichiometry. Start with the reaction equation.
Hint: http://www.titrations.info/iodometric-titration
Hint: http://www.titrations.info/iodometric-titration
Thank you for the hint.
I have worked it out and hope you can double check pls.
2S2O32- + I2 -> S4O62- + 2I-
I2 : S2O32-
1 : 2
# of mol of thiosulfate = 0.1 (0.100) = 0.01mol
Therefore, I2 = 0.01/2
= 0.005mol
Mr of I2 = 127 x 2 = 254 g mol-1
Therefore mass of I2 = nMr
= 254 x 0.005
= 1.27g
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