7 = 4. So*Kes. 60 * (. 00) X = 4 20 : 4. 50* K JOO x (6.00) = 2. Consider the following reaction: NH,HS() NH3(g) + H2S(g) 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] 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. (GHs NH2 (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]