What is the concentration of nitrate ions in a 0.125 M Mg(NO3)2 solution?

Answer:- The concentration of nitrate ions in a 0.125 M Mg(NO3)2 solution is 0.250 M.

Magnesium nitrate (Mg(NO3)2) is a strong electrolyte, which means it completely dissociates into ions in solution. When 0.125 moles of Mg(NO3)2 are dissolved in water, they produce 0.125 moles of magnesium ions (Mg2+) and 0.250 moles of nitrate ions (NO3-). Therefore, the concentration of nitrate ions in the solution is 0.250 M.

Here is the balanced chemical equation for the dissociation of magnesium nitrate:

Mg(NO3)2(aq) → Mg2+(aq) + 2NO3-(aq)

As you can see from the equation, for every 1 mole of magnesium nitrate that dissolves, 2 moles of nitrate ions are produced. Therefore, the concentration of nitrate ions will always be twice the concentration of magnesium nitrate.