10. Solution to Chemistry Problem

10. Solution to Chemistry Problem

9. The mass concentration of iron in the solution was determined by the spectrophotometric method, measuring the optical densities of solutions colored as a result of the reaction of the Fe3 ion with sulfosalicylic acid. To construct a calibration curve, the optical densities of solutions with increasing (specified) iron concentrations treated with sulfosalicylic acid were measured. The obtained data are presented in the table:

xi 0.010 0.020 0.030 0.040 0.050

yi 0.100 0.210 0.290 0.420 0.530

The optical densities of the comparison solution (control experiment for reagents, i.e. without adding iron, (background)) were 0.002; 0.000; 0.008; 0.006; 0.003. Plot a calibration graph for determining iron in water. Calculate the detection limit of iron.

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