Answer:
The correct answer is option d.
Explanation:
Concentration of hydrogen ions = [tex][H^+}=3.45\times 10^{-9} M[/tex]
The pH of the solution is given by :
[tex]pH=-\log[H^+][/tex]
[tex]pH=-\log[3.45\times 10^{-19}]=8.46[/tex]
The relation between the pH and pOH is given by :
pH + pOH = 14
pOH = 14 - pH
[tex]pOH=14-8.46=5.54[/tex]
The pOH of the substance is 5.54.