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ggL_03

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  1. ggL_03 started following Chemistry- iodine clock reaction
  2. ggL_03
    I was given distilled water, starch solution, sodium thiosulphate, potassium iodide solution and potassium persulfate solution to perform the clock reaction as attached. I want the mixed solution turning into blue black solution after 14 seconds. Therefore, exactly how much concentration of sodium thiosulphate to complete the reaction in 14 seconds???? I don't know where to start and what formula to use.
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