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Plan an investigation to determine the percentage by mass of copper in a powdered sample of argentan. A diagram may be drawn to support your answer.
Chemistry 5070 · O Level · Experimental design
Experimental design — practice question
Argentan is an alloy made up only of zinc, nickel and copper. Zinc and nickel both react with dilute hydrochloric acid, but copper does not react with dilute hydrochloric acid. Devise an investigation to determine the percentage by mass of copper in a powdered sample of argentan. Your plan must make use of common laboratory apparatus, argentan and dilute hydrochloric acid. No other chemicals may be used.