u/ElGuettoro

Hello.
I was wondering if anyone tried to make crystals with nitrate salts (like CuNO3, FeNO3 etc...) using CaNO3 and the sulfate of the metal :

MSO4​+Ca(NO3​)2​→M(NO3​)2​+CaSO4​↓

M = any metal ion

Since CaSO4 is very insoluble in water (+/- 2g/L), in theory, its presence in the solution wouldn't cause major issues with the crystallisation process.

Is there any things I should be aware about that method?

I know that Ba(NO3)2 is technically better because BaSO4 is even less soluble but its just too expensive.

I also would've preferred to do it directly with nitric acid but it is forbidden to buy in my country.