Hi, I'm writing a lab report about Iodine Clock Reaction using sodium thiosulfate, hydrogen peroxide, sulfuric acid, sodium iodide, and starch indicator. As part of my report, I need to compare my experimental value with literature value. I've searched some sources on Google, but they did not use the reactants I used.... Please help...
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I.. spent half of my summer break almost doing NOTHING. (honestly, I did my EE data collection and Chem IA data collection + applied for university's open campus and science programs. But I don't have any final draft for any of my IAs or EE)
Now, I am very depressed for not finishing any of my tasks... I am planning to finish my EE this week and Chem IA next week, but I still have Geography IA, Math IA, and Biology IA... I'm so sad... (I couldn't do Bio IA data collection, so I can't finish my Bio IA)
Am I on the right track...? I can see other smart people finishing all of their IAs during summer...
I'm doing iodine clock reaction for my school report. These are the chemical equations:
Step 1 (slow): H2O2(aq)+2I-(aq)+2H --> (aq)I2(aq)+2H2O
Step 2 (fast): I2(aq)+2S2O32-(aq) --> 2I-(aq)+S4O62-(aq)
I'm using 0.1M of NaI, 0.1M of H2O2, 0.01M of H2SO4, 0.1M of Na2S2O3, and 1% starch indicator.
I made two solutions, A and B using:
Solution A: 10mL of 0.1M NaI, 50mL of 0.01M H2SO4, 5mL of Na2S2O3, and 5mL of starch indicator
Solution B: 10mL of 0.1M H2O2
I mixed A and B, but there was no color change...
Can you guess why the reaction didn't happen? Is it because I used sulphuric acid with too small concentration or too much sodium thiosulfate?