First, we will write the equation:
Al(NO3)3 ...............> Al3+ + 3 NO3 -
We can notice that:
one mole of aluminium nitrate yields 3 moles of nitrate .
Therefore, to know the concentration on nitrate in 0.8 moles of aluminium salt, we will simply use cross multiplication as follows:
concentration of nitrate = (0.8 x 3) / 1 = 2.4 m.
The concentration of nitrate ion in a solution that contains 0.800 m aluminum nitrate is 2.4 m.
