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10 g sel 500 mL eau
n = ? V= 500 mL
PAR DISSOLUTION D’UN COMPOSE SOLIDE
KMnO 4 158 g/mol 0,05 mol/L 100 mL = 0,100 L m = M C V [g] [g.mol -1 ] [mol.L -1 ] [L] m = M C V [g] [g.mol -1 ] [mol.L -1 ] [L] m = M C V= 158 0,05 0,100 = 0,79 g
PAR DILUTION D’UNE SOLUTION EXISTANTE
Soluté : mère fille C 0 = C 1 = V 0 = V 1 = Soluté : mère fille C 0 = C 1 = V 0 = V 1 = KMnO 4 0,05 mol/L 0,005 mol/L 100 mL ? n 0 = n 1 C 0 V 0 = C 1 V 1 10 mL
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