58. Solving a chemistry problem
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58. Solving a chemistry problem
25. Calculate the concentration of nickel ( 2) in a solution whose optical density is 0.350, if it is known that a standard solution with a concentration of 1.50 mg / cm3 has an optical density of 0.265, and with a concentration of 3.00 mg / cm3 - 0.520. The test and standard solutions were prepared for photometry under the same conditions. The measurements were carried out at λ= 540 nm in a cuvette with l = 2 cm.
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