A water sample contains 0.07 mol/L MgSO4, 0.10 mol/L CaCl2 and 0.25 mol/L Na2CO3. Calculate the ionic strength of the water sample. According to the model developed by Debye-Huckel, Vi is related to the average interaction of the cation and anion in the solution. Using a Debye Huckle (D-H) equation, show that for the same ionic strength, the value of y, will always be higher for Naci solution than for Na2SO4