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pH drift of Gluconolactone
Hello!
I’m planning of making a 15% gluconolactone Toner and I would like the pH to be around 3.5-4. That being said, I know that it slowly hydrolyzes to gluconic acid over time and this causes me to have a few questions
1) I plan to adjust/ raise the pH with either sodium hydroxide or sodium bicarbonate but I’m wondering if this slow hydrolysis will cause the pH to drift back down after some time? If so how do I prevent this? I have been reading up on buffer systems and how theoretically ,they are used to keep the pH of a system constant, do you all think it will be helpful here?
2) Thoughts on using sodium bicarbonate as a pH adjuster? Any alternatives besides sodium hydroxide?
Thank you all in advance!!
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2 Replies
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First, do not use bicarbonate to adjust pH in the acid range because you will elute CO2 and end up with a fizzy product. That might be cool but it won’t help your buffering problem. Read up on buffers and the common ion effect. Phosphate, citrate, maleate, choose your method. BTW, sodium hydroxide + citric acid makes sodium citrate. Funny how folks admire sodium citrate but get annoyed with NaOH. Go figure.
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chemicalmatt said:First, do not use bicarbonate to adjust pH in the acid range because you will elute CO2 and end up with a fizzy product. That might be cool but it won’t help your buffering problem. Read up on buffers and the common ion effect. Phosphate, citrate, maleate, choose your method. BTW, sodium hydroxide + citric acid makes sodium citrate. Funny how folks admire sodium citrate but get annoyed with NaOH. Go figure.
Thank you! I’ve been doing my molarity and Henderson Hasselbalch equation homework in regards to buffer solutions haha. Hopefully I can translate from paper to practice! Thank you once again for responding to my post.
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