Guest hotkarl Posted June 16, 2005 Posted June 16, 2005 I've started making a buffer solution by mixing 6g iodometric starch in half a litre of water. I then added 20g KOH and heated it up a bit to get it to dissolve. I am now going to add a small amount of acetic acid, then adjust the pH to 4 using HCl. The thing is, my solution was colourless until the last of the KOH dissolved, I left it for 2 minutes (never do this!) and came back to find it was pale green! Please can someone suggest why?
Guest hotkarl Posted June 16, 2005 Posted June 16, 2005 I made it in a volumetric flask on a hotplate. Karl
j_p Posted June 16, 2005 Posted June 16, 2005 You heated KOH in water? Are you certain the glassware was clean?
Borek Posted June 16, 2005 Posted June 16, 2005 Practical joke? Best, Borek -- Chemical calculators at www.chembuddy.com pH calculation concentration conversion
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