Starch Iodide Paper

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bigmack
Posts: 360
Joined: 15 Dec 2015, 10:49
Job Title: Lab Assistant
State/Location: NSW

Starch Iodide Paper

Post by bigmack » 01 Sep 2017, 10:29

Teacher asked for this yesterday to test for the presents of Chlorine.
It is available commercially but I needed to make some in a hurry .

Found this You-tube link https://www.youtube.com/watch?v=ztXFWo0DyWk but its bucket Chemistry

Ended up with 1 Gram starch powder , 0.5 Grams Potassium Iodide in 150mls water .
Bring to boil while stirring .
Dip in strips of filter paper and hang up to dry .

To use , moisten strips with distilled water and hold near gas . paper will turn a blue colour depending on concentration of Chlorine .
It is very sensitive . It will turn blue with chlorinated tap water .

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