Problem: The Ka values for nitrous acid (HNO2) and hypochlorous (HClO) acid are 4.5×10−4 and 3.0×10−8, respectively.Part A:Which one would be more suitable for use in a solution buffered at pH = 7.0?Part B: What other substance containing sodium would be needed to make the buffer? Express your answer as a chemical formula.

FREE Expert Solution

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) Ka4.5×10−4

pKa = -logKapKa = -log(4.5×10-4)

pKa = 3.35


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Problem Details

The Ka values for nitrous acid (HNO2) and hypochlorous (HClO) acid are 4.5×10−4 and 3.0×10−8, respectively.

Part A:

Which one would be more suitable for use in a solution buffered at pH = 7.0?


Part B: 

What other substance containing sodium would be needed to make the buffer? Express your answer as a chemical formula.

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