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A Dubosq colorimeter consists of a cell of fixed path length an a cell of variable...

A Dubosq colorimeter consists of a cell of fixed path length an a cell of variable path length. By adjusting the length of the latter until transmission through the two cells is the same, the concentration of the second solution can be inferred from that of the former. Suppose that a plant dye of concentration 25 ug dm-3 is added to the fixed cell, the length of which is 1.55 cm. Then a solution of the same dye, but of unknown concentration, is added to the second cell. It is found that the same transmittance is obtained when the length of the second cell is adjusted to 1.18 cm. What is the concentration of the second solution?

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