1. The problem statement, all variables and given/known data 1) Equilibrium is achieved in a closed system where metallic Mg can react with HCl(aq) according to the following net chemical equation: Mg(s) + 2 H+(aq) <--> Mg+2(aq)+ H2(aq) A sodium hydroxide, NaOH(s), pellet is added to this system. What happens to the concentration of each of the species in the net equation? I don't know if I am correct, but does NaOH(s) act as a catalyst in this reaction? 2) Moles of argon gas are added to the following equilibrium system, predict the direction of the equilibrium shift. 2 NO2 (g) ↔ N2O4 (g) The addition of argon gas would increase pressure, thus the products would be favored.