Question

a) Wastes containing 10-2 M Pb2 + are wanted to be settled using Na2S. The solution is a buffered solution at pH 7 and the temperature is kept constant at 25 ° C. How many molds are the amount of sodium sulfide needed to precipitate the lead in the solution until 10-7M (Pb2 +) thick?
b) If it is desired to perform the above precipitation process for industrial wastewater with a flow rate of 100 m3 / day, what is the monthly sodium sulfur consumption?

Answer 1