30 Oct '17, 5pm

Coffee, Conspiracy, and Citizen Science: An Introduction to Iodometry

You should probably try to get your hands on elemental (or at least tincture of) iodine since povidone is going to have it’s own dissociation rate that will be influenced by the various pHs of your coffee/starch solutions or other unique traits to a specific vendor. And get some distilled or DI water if at all possible, loads of things in tap water could end up interfering with your titration. It sounds like you’re doing the experiment backwards. The write up sounds like you’re adding coffee to end-point iodine/starch solution. What you should be doing is adding excess iodine to the coffee with a starch indicator and titrating a standard oxidizer (typically a thiosulfate, another common chemical) into it. You will get a reaction adding coffee to the indicator solution but you’re opening yourself up to errors. It’s a much better practice to add standard solutions to unknown...

Full article: https://hackaday.com/2017/10/30/coffee-conspiracy-and-cit...

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