# Would dissolving Mg in NH3 help me purify Mg from all elements other than Li, Na, K, Rb, Cs, Fr, Ca, Sr, Ba, Eu and Yb? [closed]

According to Wikipedia all of the alkali metals, as well as $$\ce{Ca, Sr, Ba, Eu,}$$ and $$\ce{Yb}$$ (also $$\ce{Mg}$$ using an electrolytic process[4]), dissolve in ammonia to give the characteristic blue solutions.

Could I just dissolve $$\ce{Mg}$$ in $$\ce{NH3}$$ and then filter it to remove traces of any elements other than those substances (supposing my aim is to get any other element to get $$<\pu{0.1ppm}$$)?

• Blue solutions are temporary, until solvated electrons ( metals are already in form of ions ) reduce ammonia to amide and hydrogen. When electrolysis is involved, I doubt about selectivity. – Poutnik Jun 22 '19 at 15:27
• What other elements do you mean, alkalis and earth-alkalis? Why and in what form would they precipitate? And for what purpose? If you condense NH3 gas into a clean flask, it's already pretty ion-free. Sorry, totally unclear what you ask. – Karl Jun 22 '19 at 17:40
• @Karl All other elements. They wouldn't precipitate, but would simply not dissolve to start with. My goal is to purify Mg, not NH3. – Veritas Jun 23 '19 at 8:39
• You are not likely to find much francium in your metal. There is only an ounce or so in all of Earth's crust. – Oscar Lanzi Jun 23 '19 at 22:06
• @OscarLanzi: You are right. I just listed all the elements that theoretically dissolve in NH3. – Veritas Jun 24 '19 at 12:30