Chemistry, 26.10.2020 16:40, jsmith4184
What molar ratio of acetic acid to sodium acetate is required to create a buffer solution having a pH of 4.93 at 25°C? Ka for HC2H3O2 is 1.8 × 10–5.
Answers: 1
= Acid ionization constant of acetic acid = 
= Potential of hydrogen of buffer solution = 
![K_a=\dfrac{[H+][A-]}{[HA]}\\\Rightarrow K_a=[H+]\dfrac{[A-]}{[HA]}](/tpl/images/0840/1638/61c39.png)
on both sides of the equation we get![-\log K_a=-\log [H+]-\log\dfrac{[A-]}{[HA]}\\\Rightarrow pK_a=pH-\log\dfrac{[A-]}{[HA]}\\\Rightarrow pH=pK_a+\log\dfrac{[A-]}{[HA]}](/tpl/images/0840/1638/8d914.png)
![4.93=-\log(1.8\times 10^{-5})+\log\dfrac{[A-]}{[HA]}\\\Rightarrow 4.93-4.74=\log\dfrac{[A-]}{[HA]}\\\Rightarrow 0.19=\log\dfrac{[A-]}{[HA]}\\\Rightarrow 1.55=\dfrac{[A-]}{[HA]}\\\Rightarrow \dfrac{[HA]}{[A-]}=0.65](/tpl/images/0840/1638/a0e07.png)
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