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Ludes from phthalimide - The saga continues

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Rhodium:
Too much KI doesn't matter.

The hypochlorite converts KI to I2 until it runs out itself.

The brown I2 is reduced to colorless I- by the thiosulfate, so when the color disappears, you have added the right amount of thiosulfate.

The tricky part is to make a very EXACT solution of thiosulfate to titrate with, and to use a very EXACT amount of hypochlorite solution to begin with.

And then it is a lot of math. Ask someone else than me to help you with that, as my chem math sux...

 

http://rhodium.lycaeum.org

Methaco_s_mic:
Cheap - As long as you tell me WHAT you do and HOW MUCH chemicals as used I will be able to help you with the math, if you run into problems. I'm sure Rhodium can too, he is just lazy :) 

-Methaco(s)mic

Rhodium:
[Technical reference for the aspiring matemathician:]

ClO- + H2O + 2 I- => I2 + 2 OH- + Cl-

hypochlorite + water + iodide => iodine + hydroxide + chloride

I2 + 2 S2O3(2-) => 2 I(-) + S4O6(2-)

Iodine + thiosulfate => iodide + tetrathionate



http://rhodium.lycaeum.org

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