4. Solution to Chemistry Problem
20. The mass fraction of phosphorus in the preparation is within 0.5-1.0%. The optical densities of standard solutions containing 2.0 and 10.0 mg of phosphorus in 50 ml are 0.22 and 0.60, respectively. What sample of the preparation should be taken so that when determining phosphorus in it, the optical density of the solution under identical conditions is 0.44?
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