A buffered solution with a pH near 5 is needed for an experiment. Using the above information, which of the combinations would be the best choice to prepare the buffer?
A.
\(\ce{HIO3 + KIO3}\)
B.
\(\ce{HCN + KCN}\)
C.
\(\ce{HNO2 + KNO2}\)
D.
\(\ce{HIO4 + NaIO4}\
Exam No：AP Chemistry Problem Set 6 Year：2024 Question No：APChemistry2024AP0195
Answer:
C
Knowledge points:
8.3 Weak Acid and Base Equilibria
Solution:
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