I have one of those inexpensive kits for measuring TA. It came with a bottle of 0.2N NaOH. I know that NaOH loses strength because it combines with CO2 from the air. So the question is: how long can I keep a partially full bottle of 0.2N NaOH until I have to throw it away and get a new one? Weeks, months? I know that I can standardize it, but that requires other chemicals and equipment, which I don't have. I would just rather spend $6 every so often and be done with it. Thanks.
Question about NaOH that comes with TA kits
Jan 21, 2006
3 Replies
Don't know the answer to your question, but on the same subject. Instead of buying a new kit, does someone have an inexpensive source of .2 N NaOH? I know Fisher sells it, but it seems kinda expensive.
You can buy a 4 oz bottle of 0.2 N NaOH from austinhomebrew.com for $2.
Instead of standardizing, you could make a solution of say 7g tartaric acid in 1L distilled water and then measure TA of that - it should be
7g/L. If it's significantly off, then you can get a new solution or adjust your measurements by the "off" factor.Pp
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