----- Original Message ----- From: "ian" <[EMAIL PROTECTED]> To: <biofuel@yahoogroups.com> Sent: Saturday, June 09, 2001 5:14 AM Subject: [biofuel] titration ph question
> Hi all. > Well, I thought I'd have a play about with learning titration. Ian, pH meters have their uses but determining the endpoint of a titration of this nature is not one of them. Would suggest you go back to use of phenolphthalein indicator to determine appropriate endpoint. If you make up your own phenolphthalein soln don't forget to neutralise it after preparation as the ethanol used is acidic and will effect the end result. From memory a 1% solution is prepared by dissolving .1g of phenolphthalein in 85 mls denatured ethanol, then build volume up to 100ml with distilled water and add dilute NaOH solution with stirring until the phenolphthalein solution shows the faintest pink tinge. Regards Paul Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Please do NOT send "unsubscribe" messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
