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Old 30th July 2008, 02:09 PM
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Re: Phenolphthalein powder

I am a convert th the cheap and cheerful TUMERIC as an indicator solution. Shown to me by the Professor of Uni of WA (forgotten his name,frequents this site) who came over east to show a titration workshop to a meeting of the club back in 2005.
Go to your local supermarket or Asian grocer and get a small jar or bag of TUMERIC. About 100 grms. Yes the spice used in Indian cooking. Pour the whole contents into a 1 litre bottle of Methylated spirits and wait for the tumeric to infuse into the meth.
The meth will turn a typical yellow colour like the colour of your Butter chicken from the local Indian restaurant. Use the solution as an indicator solution just as you would Phenalpthaline. The indication is when the yellow tumeric in solution turns a "Vindaloo" RED colour. REALLY it turns a definate red. Be sure to use only the coloured meth with out any powder in it. I usually just pipette from the top of the bottle as the powder settles to the bottom of the bottle, however the Prof. suggested filtering through a coffee filter paper to remove the powder.
try it, if you cant get the expensive Phenolphthalein.
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