A Chemical Oscillator

A mixture of the following three solutions leads to an interesting reaction -
Solution A - 200 mL of water + 200 mL hydrogen peroxide (27%)- dilute to 500 mL
Solution B - 21.5 g Potassium iodate + 400 mL water + 2.15mL conc. sulfuric-> 500 mL
Solution C - 8 g malonic acid + 1.7 g manganese II sulfate hydrate->250mL then add 10mL/ 1.5g sol. starch and dilute to 500mL

Add 50mL of A to 50 mL of B- swirl ( or use a magnetic fly) then add 50 mL solution C

The mixture will go amber then black then colourless and then keep repeating this colur sequence for some time.

The overall reaction is
IO3- + H2O2+ CH2(COOH)2 (in acid) -> ICH(COOH)2 + 2O2 + 3H2O

hypiodic acid is an intermediate and [I-] controls


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