a. H3PO4/KH2PO4
b. NH4Cl/NH3
c. HNO3/NaNO3
d. HCN/NaCN
e. NaHCO3/Na2CO3
Which of the following would not make a suitable buffer pair?
2017-11-05 11:51 pm
回答 (2)
2017-11-06 12:09 am
A buffer pair is a weak acid and its conjugate base, or a weak base and its conjugate acid.
a. is a buffer pair because H₃PO₄ is a weak acid and H₂PO₄⁻ ion (in H₂PO₄) is its conjugate base.
b. is a buffer pair because NH₃ is a weak base and NH₄⁺ ion (in NH₄Cl) is its conjugate acid.
c. is NOT a buffer pair because HNO₃ is a strong acid.
d. is a buffer pair because HCN is a weak acid and CN⁻ ion (in NaCN) is its conjugate base.
e. is a buffer pair because CO₃²⁻ ion (in Na₂CO₃) is a weak base and HCO₃⁻ ion (in NaHCO₃) is its conjugate acid.
The answer: c. HNO₃/NaNO₃
a. is a buffer pair because H₃PO₄ is a weak acid and H₂PO₄⁻ ion (in H₂PO₄) is its conjugate base.
b. is a buffer pair because NH₃ is a weak base and NH₄⁺ ion (in NH₄Cl) is its conjugate acid.
c. is NOT a buffer pair because HNO₃ is a strong acid.
d. is a buffer pair because HCN is a weak acid and CN⁻ ion (in NaCN) is its conjugate base.
e. is a buffer pair because CO₃²⁻ ion (in Na₂CO₃) is a weak base and HCO₃⁻ ion (in NaHCO₃) is its conjugate acid.
The answer: c. HNO₃/NaNO₃
2017-11-05 11:52 pm
A.
收錄日期: 2021-04-18 17:56:19
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