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A buffer solution that is 0.405 M in HNO2 and 0.405 M in NaNO2 has a pH of 3.35. Addition of which of the following would increase the capacity of the buffer for added H3O^+? (Select all that apply) a) NaNO3 b)HNO2 c) pure water d) both HNO2 and NaNO2 e) none of the above