This was one of the first things learned in a chemistry class milleniums
ago. Yes, you are correct in NOT storing 10 M sodium hydroxide in glass.
This base etches the glass e.g. eats glass surface! and if you wash glass
storage jar, it appears as a milky defect on glass surface that cannot be
removed. Use plastic bottle or if you don't use a huge amount, a 50 ml
conical tube.  Set an expiration date, sometimes the solution has
flocculant gunk floating on bottom, toss and make new or make up as much as
you use in a year? 
   

At 10:31 AM 4/12/2004 -0400, you wrote:
>Hi,
>Maybe not a strictly histochemistry question but maybe someone could 
>provide me with an answer.
>I was just told that I shouldn't store the 10M NaOH that I use for 
>adjusting the pH in a glass bottle. I was told that it needed to be made 
>fresh and only kept in a plastic bottle. Why is this? How long can I 
>keep a stock solution?
>If anyone has any ideas please let me know.
>Eva
>
>
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Gayle Callis
MT,HT,HTL(ASCP)
Research Histopathology Supervisor
Veterinary Molecular Biology 
Montana State University - Bozeman
PO Box 173610
Bozeman MT 59717-3610
406 994-6367 (lab with voice mail)
406 994-4303 (FAX)



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