To remove the solution containing melal from a part after metal plating the part is commonly rinsed with water. This rinse water is contaminated with metal and must be treated before discharge. The Shimy Metal Plating Co$.$ uses the process fiow diagram shown in $$ Fure P$-2\mathrm{.}11.$ The plating solution contains $85\frac{g}{L}$ of nickel. The parts drag out $0\mathrm{.}05\frac{L}{m}in$ of plating solution into the finse tank. The flow of rinse water into the rinse tank is $150\frac{L}{m}in.$ Write the general mass balance equation for the rinse tank and estimate the concentration of nickel in the wastewater stream that must be treated. Assume that the rinse tank is completely mixed and that no reactions take place in the rinse tank.