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15. Solving a chemistry problem
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last one 19.11.2023
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Uploaded: 26.06.2023
Content: 91.rar 19,62 kB
Refunds: 0
Uploaded: 26.06.2023
Content: 91.rar 19,62 kB
Product description
91. When determining the impurity of Ni in salt Co, a sample of the last mass of 2.3520 g was dissolved, the necessary reagents were added - HCl, gelatin, pyridine - and diluted to 50 ml. A 25 ml aliquot of the solution was polarographed and a diffusion current of 2.5 μA was obtained. Then, 5 ml of a standard solution containing 1.00 • 10–2 mol/l NiCl2 was added to the polarographic cell and a diffusion current of 4.9 μA was obtained. Calculate the mass fraction of Ni in the preparation.
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