I'm doing this paper too; basically ... just to clear up as some posts seem to be a little irrelevant to what we are trying to figure out! ... we've been given the NaOH solution with an "approximate concentration of 2mol dm-3". We have to find the conc "as accurately as possible" BOTH methods have to include chemical reactions (ie so cant use a pH meter) and only one is allowed to use a titration.
To me this is as close to my thinking as I've seen:
If you feel confident that all Na+ is only from NaOH, you can use: "Uranyl Zinc Acetate”.
but the thing is the whole uranyl zinc acetate thing is a bit far fetched I think ... they want us to use substances that we use in a college lab.
Does anyone know of anything else that's insoluble in NaOH because I don't really know how you figure that out! (it does have to be insoluble doesn't it in order to form a precipitate and then weigh it?)
Also ... once you have the precipitate ... what exactly would it be and how do you calculate the conc of NaOH from it?
Am fine with calculating it from a titration but this bit loses me!
Thanks muchly for any help given!
ps. sorry for the loooong post!