Answer:
pkb =2.92
Explanation:
pH is defined as the negative logarithm of the concentration of hydrogen ions.
Thus,
pH = - log [H⁺]
Given that:- pH = 12.04
Also, pH + pOH = 14
So, pOH = 14 - 12.04 = 1.96
The expression of the pOH of the calculation of weak base is:-
[tex]pOH=-log(\sqrt{k_b\times C})[/tex]
Where, C is the concentration = 0.1 M
[tex]1.96=-log(\sqrt{k_b\times 0.1})[/tex]
[tex]\log _{10}\left(\sqrt{k_b0.1}\right)=-1.96[/tex]
[tex]k_b=\frac{1}{10^{3.92}\cdot \:0.1}[/tex]
[tex]k_b=0.00120[/tex]
pkb = -log kb = [tex]-\log 0.00120[/tex] = 2.92
