94. Solving a chemistry problem
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94. Solving a chemistry problem
81 In the analysis of commercial potassium alum, a weighed portion of 2.6710 g was dissolved in 200 ml of water and barium sulfate was precipitated from 20 ml of the resulting solution. What percentage of aluminum is contained in the preparation if the mass of the calcined precipitate of barium sulfate is 0.2680 g?
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