Mingrulz34 Posted January 10, 2017 Report Share Posted January 10, 2017 So for my IA, I dissolved a 1000mg vitamin c tablet in 355mL of water, took 20mL of it and diluted it to 100mL making it about 0.0032mol/L. I then added 5mL of 0.5mol/L potassium iodide, 5mL of 1.0mol/L hydrochloric acid and some 6 drops of 1 gram of starch dissolved in 100mL of water. I then titrated that entire sample with potassium iodate to determine the concentration of vitamin c. The endpoint was suppose to be when the solution turned blue (iodine+starch) but it ended up slowly turning yellow and then becoming darker until it eventually turned red. I tried increasing the concentration of potassium iodate but it just lead to the solution becoming red faster. I think I should have enough I had quit my IA and am excpected to redo it sometime later. Does anyone have any idea what has happened to my experiment? Any help would be appreciated. Thanks! Reply Link to post Share on other sites More sharing options...
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