strange PH effect

suchtdruck24

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I observed a phenomenon when salting out a-oil in the past. I was working with methanol. For example, after setting the pH to 7 and letting the product stand for a while, it rose to 8, which seems to be normal. When I then lowered it back to 7, it went back to 8 after a few hours. I was able to repeat this several times.
The feedback from customers wasn't so good as i can remember. So I learned for myself that maybe you should set the pH correctly the first time.

Has anyone had a similar experience?
 

Osmosis Vanderwaal

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what you are using to adjust your ph could be reacting with something in you RM or was it hot to start and cooled as you kept measuring? HCL is a gas that evaporates and when it does, the ph goes up. 3 of 100 possibilities
 

suchtdruck24

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Thanks for the reply. I used a digital pH meter. Not a cheap one, but one without temperature compensation i guess. From what I read now, that's probably not normal, and the effect was probably due to temperature fluctuations. I never considered that before.
 

GhostChemist

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The temperature affects the reaction rate and accordingly on the pH

The volume (You didn't write it) of your RM and effective mixing also affect pH
 
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