Q1. The concentration of Pb in sample of wastewater is to be determined by using gravimetric analysis? to a 1000.0 ml sample of the waste water is added an excess of sodium sulfide forming insoluble lead II sulfide(239.266g/mol) according to the balance equation given below. the solid leadII sulfide is dried and it’s mass is measured to be 0.1209g. what was the contraction of Pb2 in the original wastewater sample?Pb2 (aq) Na2S(aq) —> PbS(s) 2Na (aq)
