HAHS(s) NH3(8) + H25(8) Keg = 8.5 x 10-3 a) A reaction mixture at this temperature containing solid NH HS has [NH,] = 0.166 M and [H,S] = 0.166 M. Is this system at equilibrium? Explain, based on your calculated Q value. [3 marks] Q = ( N Hy ] ( HS ) (NHLS = CHS) 20.166M b) Will more of the solid form or will some of the existing solid decompose as equilibrium is reached? How do you know? [2 marks] 4. A weak base, Aniline, reacts with water according to the reaction below. C 6HSNH2 (20) + H20 (1) -> CGHSNH3# (aq) + OH" (aq) a) A sample of aniline is dissolved in water to produce 25.0 ml of a 0.10 M solution. The pH of the solution is 8.82. Calculate the equilibrium constant, K, for this reaction. [3 marks] b) The solution prepared in part b is titrated with 0.10 M HCI. Calculate the pH of the solution when 5.0 mL of the acid has been added. [4 marks]