Sometime ago I started a thread asking for borax pka.
For some reason I don't know yet, it seems that there's no simple answer to that.
More generally, I wonder:
- how to calculate pH of a solution containing borax, or any other substance without a known pka (and, if possible, why aren't they known),
- how to calculate a buffer.
In photographic chemistry, borax is used as an alkali and sometimes as buffer also, along with boric acid.
Boric acid pka values are known, but what about borax? What's special about it?
All I know from practice is that a solution with borax tends to easily achive a pH close to 9.
Is there any way to work with this for home experimentation without relaing on trial and error?
Thanks for any advice or guide on this.