The ka of the hypothetical acid hx is 0.251.
pH is defined as the negative logarithm of hydrogen ion concentration.
for neutral solution pH = 7
pKa is a number that describes the acidity of a particular molecule. The lower the value of pKa, the stronger the acid and the greater its ability to donate its protons.
salt concentration = [salt] = 0.25 M
The potential of hydrogen = pH = 11.45
[acid] = [tex]10^{-11.45}[/tex]
= 3.54 * [tex]10^{-12}[/tex] M
According to Henderson Hasselbach's equation
pH = pka + log[salt] / [acid]
11.45 = pka + log (0.25 / 3.54 * [tex]10^{-12}[/tex] )
pka = 11.45 - log (0.25 / 3.54 * [tex]10^{-12}[/tex] )
pka = 11.45 - 10.85
pka = 0.6
ka = [tex]10^{-pka}[/tex]
= [tex]10^{-0.6}[/tex]
ka = 0.251
The ka of the hypothetical acid hx is 0.251.
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