The pH of a 0.5L HNO2-NO2 buffer solution was determined to be 4.23. The solution was mixed with 5g of HNO2. Considering that the pKa is 4.35, what is the approximate pH of the new solution? Show all pertinent calculations. The MW of acid = 47g/mol. Illustrate the titration curve of the solution as a diprotic acid. Compute for the optimal pH if 1M of the solution is prepared. Illustrate what happens to the buffer system if additional acid or base is added to the solution. Label all parts accordingly.

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