87.4 Activity and activity coefficient Some facts of strong electrolytes solution present species 0.52 mol- 3KCI 95%K++5%KCl 0. 25 mol,SO4 76% Na*+ 24%NaSO4 0.1 mol dm-3 CuSo 44% CuSO Effective concentration is rather different from the actual concentration Activity coefficient is essential for quite dilute solutionssolution present species 0.52 mol·dm-3 KCl 95% K+ + 5% KCl 0.25 mol·dm-3 Na2SO4 76 % Na+ + 24% NaSO4 ¯ 0.1 mol·dm-3 CuSO4 44% CuSO4 Some facts of strong electrolytes Effective concentration is rather different from the actual concentration Activity coefficient is essential for quite dilute solutions §7.4 Activity and activity coefficient