NaOH (1 Viewer)

[dead]

I used to know the answer to this question but now i forgot
"why is sodium hydroxide not used as a primary standard?"
i know it might be a stupid question but it has come up and im curious about the answer....

 

[serge]

water can evaporate making the concentration higher...
making the pH higher
Carbon dioxide can dissolve into it making the pH lower

 

[dead]

oh ok lol ty

 

[Dreamerish*~]

NaOH absorbs moisture from the air and reacts with carbon dioxide, whereas anhydrous sodium carbonate does not, but you still need to dessicate it.