The maximum buffering capacity of a solution is when the pH of the solution is equal to pKaand the buffer range of a solution is pH = pKa ± 1.
• maximum buffering capacity: pH = pKa
• buffering range: pH = pKa ± 1
Part A. Calculate pKa of the acids
nitrous acid (HNO2) Ka = 4.5×10−4
pKa = 3.35
The Ka values for nitrous acid (HNO2) and hypochlorous (HClO) acid are 4.5×10−4 and 3.0×10−8, respectively.
Which one would be more suitable for use in a solution buffered at pH = 7.0?
What other substance containing sodium would be needed to make the buffer? Express your answer as a chemical formula.
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