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s s s
Ksp LSO4 = [L²⁺][SO4²⁻]
2,5 x10⁻⁵ = [s] [s]
s² = 2,5 x10⁻⁵
s = 5 x10⁻⁵ mol/liter
mol LSO4 = 5 x10⁻⁵ mol/liter x 0,5 liter = 0,0025 mol
massa LSO4 = 0,34 gr
Mr LSO4 = 0,34 gr / 0,0025 mol = 136 gr/mol