33 mL of 0.45M nitrous acid, HNO2 {Ka=4.5*10^-4} is titrated with the 0.50M NaOH.
1. Write down the acid and base dissociation equilibrium reaction for this titration.
2. Calculate the ph for this reaction at the equivalence point.
3. Calculate the ph for this reaction when half the amount of titration requires red to reach the equivalent point has been added.