1. The problem statement, all variables and given/known data 20.0 mL of .200 M hydrochloric acid are mixed with 20.0 mL of .300M ammonium hydroxide. What is the pH? Also says that if ammonium hydroxide is in excess it immediately breaks down into ammonia and water. 3. The attempt at a solution I know the NH4OH is in excess, there are .006mol of NH4OH, .004 mol of HCl. I'm not entirely too sure how to write the equation for this one. HCl + NH4OH -> NH4Cl + H2O HCl + NH3 + H2O -> NH4Cl + H2O HCL + NH3 -> NH4Cl Are any of these right to help me solve the equation? I don't know how to write the equation so I can find the concentration of the hydronium ions, thus finding the pH.