20. Solving a chemistry problem
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73. Will drinking water be harmful to health if it contains: a) 3.3*10-6 mol/l Fe2+; b) 1.7*10-7 mol/l Ni2+; c) 1.9*10-7 mol/l Cr3+? Sanitary standards allow the content in drinking water of 0.2 g / m3 of iron (II), 0.1 g / m3 of nickel (II), 0.05 g / m3 of chromium (III).
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