140. Solving a chemistry problem

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20. Using the Bouguer - Lambert - Beer equation, determine the parameter "X" (in accordance with the task number) in the specified units (Table 2).
Determined ion or substance Аl3
The reaction of the formation of a colored compound with oxyquinoline AlR3
Wavelength, nm 390
ε 6700
Layer thickness, cm X
Concentration 0.00025 mol / l
Optical density 0.836

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