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Testing TA with Ph meter

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Steve_M

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i know how to go about using Ph meter for TA results. What I’m curious is how long others take to run this particular test? I see a very slow rise in Ph and have gone nearly an hour to reach 8.2, am I going too slow with each addition?

Thanks,
Steve
 

whackfol

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Just a couple of minutes a sample. I use a stirrer, burret with a nice stopcock and a pretty fast meter. By hand shake/stirring, with a syringe, 5 min would seem appropriate.
I test twice over the previous sample. If there is a difference, I test again. Repeatability is vital.
 
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Ajmassa

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My old meter used to do that if I let it sit. My current meter shows a little hourglass as it’s locking in on the level. Once that hourglass is gone that’s my reading. Usually quick but sometimes can take a min or 2.
Once you get over 6.5ph during the test your pretty much there anyway and can almost predict the rest. Only a few more mL of naOH is needed at that point.
 

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