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Plan an investigation to determine the percentage by mass of zinc in a powdered sample of Muntz metal that contains only zinc and copper. Your plan should make use of ordinary laboratory apparatus, Muntz metal and dilute sulfuric acid. No other chemicals should be used. Your plan must include: the apparatus required; the procedure to follow and the measurements to record; steps to make the percentage found as accurate as possible; how the measurements are used to determine the percentage by mass of zinc in the Muntz metal sample.