Ionic strength is the concentration of ions in a solution. It is a measure of the total concentration of ions in a solution and is defined as 1/2 the sum of the product of the concentration of each ion in the solution and the square of its charge.


The formula for ionic strength is given by the following equation:
Ionic Strength (I) = 1/2 × Σmi(ziei)2
where,
mi = molar concentration of the ion i
zei = charge on the ion i


Fe2(So4)3 dissociates into three ions, two Fe3+ ions, and three SO42- ions. Therefore, the ionic strength of the solution can be calculated as follows:

Ionic Strength (I) = 1/2 × [(2 × 0.1)×(3)2 + (3 × 0.1)×(-2)2]
Ionic Strength (I) = 1/2 × [1.8 + 1.8]
Ionic Strength (I) = 1.8

Therefore, the ionic strength of 0.1 M aqueous solution of Fe2(So4)3 is 1.8.


The ionic strength of a solution is a measure of the total concentration of ions in the solution. In this case, the ionic strength of the 0.1 M aqueous solution of Fe2(So4)3 is calculated to be 1.8.