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Updated: April 30, 2025
In the electrolysis of a 0.8000 gram sample of brass, there is obtained 0.0030 gram of PbO , and a deposit of metallic copper exactly equal in weight to the ignited precipitate of Zn P O subsequently obtained from the solution. What is the percentage composition of the brass? !Answers!: 69.75% Cu; 29.92% Zn; 0.33% Pb. !Answer!: 2.48 cc. !Answer!: 0.83 cc. !Answer!: 0.0152 gram.
This alone occurs while the solution is relatively concentrated. At the anode the lead is deposited as PbO and oxygen is evolved. Its removal promotes the complete precipitation of the copper. The reaction is Filter off the iron precipitate, using a washed filter, and wash five times with hot water.
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