Question

A dye solution of concentration 0.04M shows absorbance of 0.045 at 530 nm; while a test solution of same dye shows absorbance of 0.022 under same conditions. Find the concentration of solution​

Answer 1

Answer:

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Explanation:

Full Text Available A kinetic spectrophotometric method for determination of lisinopril in pharmaceuticals has been developed. The method is based on activator action of lisinopril on Cu(II ions catalysing the oxidation of nile blue A with hydrogen peroxide in borate buffer (pH 9.3. A decrease of the absorbance was recorded at 635 nm for 5 min at 25°C. The linearity was established applying the tangent method within the concentration range of lisinopril from 0.8-6.4 μg mL-1, the detection and quantification limits being 0.158 μg mL-1 and 0.480 μg mL-1, respectively. The method has been successfully applied in three brands of tablets containing lisinopril alone or in combination with hydrochlorothiazide.