Compute for the concentration of an alcoholic solution of Methylene blue with an absorbance reading of 0.6681. A standard calibration was done which yielded the following result: Conc ABS 3.000 ppm 0.2099 7.000 ppm 0.4421 15.000 ppm 0.7892 20.000 ppm 0.9931   Choices: a. 12.559ppm c. 14.559ppm b. 13.559ppm d. 11.559ppm

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