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A buffer solution that is 0.349 M in HCN and 0.349 M in NaCN has a...

A buffer solution that is 0.349 M in HCN and 0.349 M in NaCN has a pH of 9.40. Addition of which of the following would increase the capacity of the buffer for added OH-?

both HCN and NaCN

NaCN

HCN

pure water

None of the Above

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