Question about NaOH that comes with TA kits

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.

Reply to
Igor
Loading thread data ...

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.

Reply to
Crhoff

You can buy a 4 oz bottle of 0.2 N NaOH from austinhomebrew.com for $2.

Reply to
Igor

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

Reply to
pp

DrinksForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.