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2. You are tasked to use a strong-acid polystyrene cross-linked with pure divinyl benzene ion- exchanger resin operated with a sulfonated sodium to remove aluminum from a wastewater stream. The influent water has only two cations with 5 meq/L of aluminum and 2.5 meq/L of sodium. The exchanger has a capacity of 2 eq/L with an operating equilibrium constant of 3 for aluminum. a) Derive the relationship between the concentration of aluminum in solution and resin that governs this exchange. Also, generalize the equation for an ion of valency 'n'. b) Write down the chemical reaction that is expected to take place between the resin and aluminum in wastewater. Estimate how much of wastewater can be treated per ft3 of resin before it has to be regenerated.