Consider a 0.70 M solution of Al(NO3)3 in water. What is the nitrate ion concentration in this solution, in units of moles/L?
You have thrice the concentration of nitrate ions for the basic concentration value.
To find the nitrate ion concentration in the solution, we need to determine the moles of nitrate ions present in the solution.
First, we need to identify the number of moles of Al(NO3)3 present in 1 liter (L) of the solution. The concentration of Al(NO3)3 is given as 0.70 M, which means there are 0.70 moles of Al(NO3)3 present in 1 liter of the solution.
Since Al(NO3)3 dissociates into one mole of Al3+ ions and three moles of NO3- ions, the number of moles of nitrate ions (NO3-) in the solution is three times the moles of Al(NO3)3.
Therefore, the nitrate ion concentration in the solution, in units of moles/L, is:
0.70 M Al(NO3)3 × 3 moles NO3-/1 mole Al(NO3)3 = 2.10 M NO3- ions.
Hence, the nitrate ion concentration in this solution is 2.10 moles/L.