Buffer Video Lessons

Concept:

# 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 = 3.35

93% (224 ratings)
###### 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.