How do you prepare a solution of an ion. For example how would I prepare a 1 molar solution of Mg2+?

Question

How do you prepare a solution of an ion. For example how would I prepare a 1 molar solution of Mg2+?

Answer 1

You would dissolve 1 mol MgCl2 in 1 litre of water and you would have:

MgCl2 <=> Mg2+  +  2Cl-

This solution would therefore be 1 molar Mg  2+

Answer 2

[Mg2+] = 1 M means 1 mole of a salt containing Mg2+ + enought water to reach the volume of 1 L

The salt must be soluble so we can take Mg(NO3)2.

Molar mass = 148 g/mol

We use 148 g ( => 1 mole) + enought water to reach the volume of 1 L