Assuming complete dissociation, ion concentrations are Ca²⁺.01,Cl⁻.02,Na⁺.002,SO₄²⁻.001 M. Ionic strength is $$I=\tfrac12\sum c_iz_i^2=\tfrac12[.01(4)+.02(1)+.002(1)+.001(4)]=\mathbf{.033}\ \mathrm M.$$ Charge is squared, so anions and cations both contribute positively.
More Principles of Water Chemistry questions
GATE 2024 ES Q54– Mix2 MLD wastewater at 45°C, pH2 with 3 MLD at 30°C, pH8. Neglect buffering and…
GATE 2023 ES Q14– A water sample is colorless with phenolphthalein but yellow after methyl-orange addition.…
GATE 2023 ES Q50– Gas A has aqueous solubility16 mg/L at vapor pressure.042 atm and 25°C. In a closed system…
GATE 2022 ES Q15– Specific conductance indirectly estimates dissolved solids in water. Which species…
GATE 2022 ES Q21– For recarbonation,1 L solution contains 1 mol/L supersaturated calcium carbonate. How many…
GATE 2022 ES Q54– Water at pH6 contains .001 mol/L zinc ions. Zinc hydroxide Ksp=8×10⁻¹⁸ (mol/L)³. Ignore…