Question

Consider an aqueous solution, prepared by adding the following four components, and diluting to a total volume of 0.250 L: - 5.00 mmol of sodium phenoxide (NaPh) *Phenol, HPh: pKa = 9.997 -1.00 mmol of acetic acid (HAC) *Acetic acid, HAC: pKa = 4.756 - 3.50 mmol ammonium chloride (NH4CI) *Ammonium, NH4+: pKa = 9.245 - 10.0 mmol NaCl a) Write balanced equations for each of the chemical reactions for all the equilibria present in this solution. b) Excluding solvent, identify all dissolved species present in this solution. c) What are the equations we can write for this system if we want to solve for the concentration of each species? Write out each of the equations you would need to use to solve for each of the concentrations exactly. Include activity coefficients in your equations where appropriate. NOTE: You do not need to solve for any numerical values, simply write out each of the equations to determine if you could solve them numerically, d) Can we solve for the concentrations of all ions in solution? Answer yes or no and then explain briefly why. e) What approximation(s) must we make to solve this problem?