Please help with 2,3, and 4

2. When placed in water, the ammonium ion will undergo the reaction shown below. NH4NH3+H+ Write the correct expression for the equilibrium constant for the chemical equation written above. 3. The following concentrations were found at equilibrium at 20c for the reaction shown above: [NH3]1.19105M;[H+]=1.19105M; and [NH4+]0.25M. Use the concentrations given with the expression for the equilibrium constant to calculate the value of the equilibrium constant for the reaction at this temperature. 4. The equation for dissociation of the ammonium ion in water is written in a complete form showing the water as: NH4+H2ONH3+H3O+ Use the Bronsted-Lowry acid-base definitions, given in the chemical reactions chapter of the lecture textbook, and identify the acid and the base on the reaction side