Respuesta :
Answer:
HC₂H₃O₂/KC₂H₃O₂
Explanation:
Considering the Henderson- Hasselbalch equation for the calculation of the pH of the basic buffer solution as:
[tex] pH=pK_b+log\frac{[salt]}{[acid]} [/tex]
For a best pair, the pKa value must be equal to pH.
NH₃/NH₄Cl forms a basic buffer and cannot account for pH = 5
out of the acidic buffer given,
So, HF , Ka = 3.5 × 10⁻⁴ , So pKa = 3.46
HC₂H₃O₂ , Ka = 1.8 × 10⁻⁵ , So pKa = 4.77
The best pair to show pH = 5 is HC₂H₃O₂/KC₂H₃O₂
The pair for the best choice for a pH 5 buffer is:
HC₂H₃O₂/KC₂H₃O₂
Henderson- Hasselbalch equation:
The equation that is used for calculation of the pH of the basic buffer solution as:
pH= pkb + log [salt]/ [acid]
For a best pair, the pKa value must be equal to pH.
NH₃/NH₄Cl forms a basic buffer and cannot account for pH = 5
Out of the acidic buffer given,
So, HF , Ka = 3.5 × 10⁻⁴ , So pKa = 3.46
HC₂H₃O₂ , Ka = 1.8 × 10⁻⁵ , So pKa = 4.77
The best pair to show pH = 5 is HC₂H₃O₂/KC₂H₃O₂
Find more information about pH here:
brainly.com/question/24595796
