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1、 Namely,the reaction quotient(J)criterion of precipitation-dissolution equilibrium,as follow:1.The solubility-product rule(aq)mB(aq)nA (s)BAnmmn-+J Balance shifts to the left Precipitate occurs J=In equilibrium Saturated solution J Balance shift to the right No precipitation if there is a precipitat
2、e,it could be dissolvedPbCrO4(s)To promote the formation of BaCO3 Added BaCl2 or Na2CO3 Added acid:(aq)CO(aq)Ba (s)BaCO2323-+to favor in BaCO3 dissolution23 so:)(CO JJc,-c(Ba2+)so:Application of Solubility Product Rule Formation of precipitation (1).Beginning of precipitation:J Ksp Complete precipitation:ci So,there is BaSO4 precipitation(aq)SO (aq)Ba (s)BaSO2424-+Before reaction/(mol/L)After reaction/(mol/L)is small