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mmol L2SO4 = 200 x 0,2 = 40 mmol
2 L₁OH + L₂2SO4 =>L₁2SO4 + 2 L₂2O
a : 40 40
b : 40 20 20 40
s : - 20 20 40
[L₂2SO4] = 20 mmol / 400 ml = 0,05 M
[H+] = 2 x [L₂2SO4] = 2 x 0,05 = 0,1 M
pH = - log [H+]
pH = - log 0,1
pH = 1