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1.250g of an alloy which is 90% Ag and 10% Cu is dissolved in nitric acid yielding AgNO3 and CU(NO3)2 solution. The nitrates are converted to Ag2SO4 and CuSO4 by heating with H2SO4. To the solution of the sulfates is added a piece of copper wire which reacts with Ag2SO4 to precipitate all the silver. the reaction is
Ag2SO4+ Cu = 2Ag + CUSO4.
The resulting solution is treated with excess zinc to precipitate all of the copperII ion in th solution. What weight of copper will be preciptiated?
