145. Solving a chemistry problem

Product description

• Option 2

50.00 ml of standard solutions of cobalt (0.30 μg / ml) and nickel (0.10 μg / ml) were placed in two separatory funnels, N, N’-diethyldithiocarbamate was added and the resulting CCl4 complexes were extracted. Extracts were collected and diluted to 10.00 ml CCl4. The optical density of both extracts was measured at 367 and 328 nm in cuvettes of l = 1.0 cm and obtained: A367, Co = 0.365, A328, Co = 0.100, A367, Ni = 0.186, A328, Ni = 0.300.

An aliquot of the analyzed solution with a volume of 50.00 ml containing cobalt and nickel was placed in a separatory funnel and all the reagents were added, as for standard solutions. The optical density of the obtained extract (10.00 ml of CCl4) was measured at 367 and 328 nm. l = 1.0 cm

Calculate the concentration (µg / ml) of cobalt and nickel in the analyzed solution from the results of measurements:

• A367 = 0.410; A328 = 0,320