(Answered) Q1 the concentration of pb in sample of wastewater is to

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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)

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