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.

Question about NaOH that comes with TA kits
 

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.

"Igor" > wrote in message
oups.com...
>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
 

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

Question about NaOH that comes with TA kits
 

Igor wrote:
> 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.

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