21. Solving a chemistry problem
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21. Solving a chemistry problem
3. Calculate the concentration of copper (in mol/l) in the solution, if, when analyzing 20 ml of the test solution by the addition method, a wave height of 15 mm was obtained, after adding 3 ml of a standard solution with a concentration of 0.1 mol/l, the wave height increased to 17 .6 mm.
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