1. Calculate the concentration of the element (X) in the analyzed sample (mathematically and graphically).
Pb2, mol/l 5*10-2 10-1 1.5*10-1 2*10-1 2.5*10-1 X
h 3.0 5.8 7.9 10 12.3 6.1; 6.3; 5.7; 5.9; 6.0
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