7. (20%) (a) Find the equilibrium constant for following acid dissociation reaction at 25C. Start your answer by writing the equation for K, written with AG. NH4 NH3 + H* Is your calculated equilibrium constant (K2) consistent with the value given in the course handout? (b) Find K, for the reaction at 10 and 40C. Discuss how temperature affects fractionation between NH4+ and NH3. (C) NH3 is often called free ammonia as opposed to ammonium ion. While ammonia ions are relatively benign, free ammonia is known to be toxic for microbial growth at high concentration especially in high strength wastewater treatment. Briefly discuss about potential temperature effects on the toxicity in biological wastewater treatment