What is the molar concentration of nitrate ions in a 0.161M magnesium nitrate(aq) solution?
0.161 M Mg(NO3)2.
There are two nitrate ions in one molecule of Mg(NO3)2; therefore, the nitrate is twice the concn of Mg(NO3)2.
To find the molar concentration of nitrate ions in a magnesium nitrate solution, we need to examine the chemical formula of magnesium nitrate and its dissociation in water.
The chemical formula for magnesium nitrate is Mg(NO3)2. This means that each formula unit of magnesium nitrate contains two nitrate ions (NO3-) and one magnesium ion (Mg2+).
When magnesium nitrate dissolves in water, it dissociates into its constituent ions:
Mg(NO3)2(s) → Mg2+(aq) + 2NO3-(aq)
Since 1 molecule of magnesium nitrate produces 2 nitrate ions, the molar concentration of nitrate ions will be twice the molar concentration of magnesium nitrate.
Therefore, the molar concentration of nitrate ions in a 0.161M magnesium nitrate solution will be:
2 * 0.161M = 0.322M.