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Water testing method

determining residual chlorine by iodometric method using acetic acid ,potassium iodide,starch indicator and than titrate with sodium thiosulphate but the problem is some time yellow color not appear after adding potassium iodide and also in every trials blue color not appear after adding starch indicator please provide me solution by finding gaps/problem during this test.

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https://fstdesk.com/t/water-testing-method/5147

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