DOSAGE DES IONS NICKEL (II) PAR SPECTROPHOTOMÉTRIE 1.

Solution mère C0 = 5,0 × 10-1 mol.L-1 V0 = ?

Solution fille C1 = 3,0 × 10-2 mol.L-1 V1 = 50,0 mL

Afin de préparer la solution fille, on va effectuer une dilution. Au cours d’une dilution la quantité de matière en chlorure de nickel (II) se conserve : n0 = n1 C0.V0 = C1.V1 soit V0 = C1.V1/V0 = 3,0 mL 2. On prépare la solution diluée dans une fiole jaugée de 50,0 mL. Pour prélever 3,0 mL on utilise une pipette graduée de 5,0 mL et un becher de 50 mL.

4. On obtient une droite passant par l’origine O (0 ; 0) et le point M (0,60 ; 0,12) de coefficient directeur a = 0, 60 / 0,12 = 5,0 L.mol-1 On obtient la relation : A = 5,0. C. 5. Le spectre montre une absorbance égale à 0,50 à 404 nm. C = A / 5,0 C = 0,50 / 5,0 = 0,10 mol.L-1 6. Vérification graphique de C, voir ci-dessus.

Dosage nickel (II)_CORR.pdf

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