4. Find the optimal thickness of the absorbing layer for photometry of a colored solution of a complex compound of lead with PAR with a molar absorption coefficient εmax equal to 37000 at a complex concentration of 0.05 mg in 50 cm3. The optimal transmittance value was 25.8%. The ratio of lead and PAR (C11H9N3O2) in the complex compound is 1:1.

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