Which one of the following is a buffer solution?
A) 0.10 M NaCl
B) 0.40 M HNO3 and 0.10 M NaNO3
C) 0.40 M KF and 0.10 M HF
D) 0.40 M CH3COONa
E) 0.40 M HBr and 0.10 M NaBr
Correct Answer:
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