43. Solving a chemistry problem
2. Calculate the mass fraction (%) of copper in the ore, if copper was transferred from a sample of ore weighing 0.6215 g into a solution in the form of Cu2+, KI was added to this solution, and 18.23 ml of sodium thiosulfate solution with T( Na2S2O3/Cu)=0.006208. Answer: 18.21%.
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