1. Calculate the pH value of a solution having a concentration of H + (hydrogen ion) of 5.35E-09 M at 25C ? (Include 2 decimal points). pH =??

1. Calculate the pH value of a solution having a concentration of H+(hydrogen ion) of 5.35E-09 M at 25°C ? (Include 2 decimal points).

pH =??

2. The pKa of the ammonium ion is 9.25. NH3/NH4+ is a good buffer:a.  Between pH 10.25 and 11.25.  b. Between pH 7.25 and 8.25.  c. At pH values less than 7.0.  d. At pH 4.63.  e. Between pH 8.25 and 10.25.