20. Solving a chemistry problem
76. Is it possible to drink milk without harm to health, 1 liter of which contains: a) 0.04 mg of Pb2+ cations; b) 0.6 mg Cu2+ cations; c) 4.5 mg of Zn2+ cations? The sanitary norms for the content of these ions in milk are 2.4*10-7, 1.6*10-5, 7.7*10-5 mol/l, respectively.
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