Question

Which of the following buffer systems would be the best choice to create a buffer with...

Which of the following buffer systems would be the best choice to create a buffer with pH = 9.05?
HF/KF
HNO2/KNO2
NH3/NH4Cl
HClO/KClO

For the best system, calculate the ratio of the masses of the buffer components required to make the buffer.

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