Consider the following method for the analysis of cocaine (MW 303.35) powder. "Dissolve about 600 mg of cocaine, preciously dried and accurately weighed, in 50 mL of glacial acetic acid, add I drop of crystal violet TS, and titrate with 0.1 M perchloric acid VS to a green endpoint. Perform a blank determination, and make the necessary correction" Calculate the percentage purity of the cocaine sample from the data below. Show your reasoning clearly and record your final answer to four significant figures. • Cocaine powder weighed - 606.3 mg • Concentration of HCIO3 = 0.09978 M H₂C- Lo Volume HCIO; required for the assay mixture = 19.97 mL Volume HCIO; required for blank determination = 0.059 ml
Consider the following method for the analysis of cocaine (MW 303.35) powder. "Dissolve about 600 mg of cocaine, preciously dried and accurately weighed, in 50 mL of glacial acetic acid, add I drop of crystal violet TS, and titrate with 0.1 M perchloric acid VS to a green endpoint. Perform a blank determination, and make the necessary correction" Calculate the percentage purity of the cocaine sample from the data below. Show your reasoning clearly and record your final answer to four significant figures. • Cocaine powder weighed - 606.3 mg • Concentration of HCIO3 = 0.09978 M H₂C- Lo Volume HCIO; required for the assay mixture = 19.97 mL Volume HCIO; required for blank determination = 0.059 ml
Chapter31: Introduction To Analytical Separations
Section: Chapter Questions
Problem 31.19QAP
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