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Solutions A and B show A 20 0.8 and 0.2 respectively. How many mL of A and B should be mixed to obtain the solution

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Solutions A and B show A 20 0.8 and 0.2 respectively. How many mL of A and B should be mixed to obtain the solution C that shows A420 = 0.25. Calculate the molar concentration of C if the milimolar extinction coefficient is equal to 200 mm-cm-7

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