Answer : The pH of a solution is, 11.88
Explanation: Given,
Concentration of [tex]OH^-[/tex] ion = [tex]7.5\times 10^{-3}M[/tex]
First we have to calculate the pOH.
Formula used :
[tex]pOH=-\log [OH^-][/tex]
[tex]pOH=-\log (7.5\times 10^{-3})[/tex]
[tex]pOH=2.12[/tex]
Now we have to calculate the pH.
Formula used :
[tex]pH+pOH=14\\\\pH=14-pOH\\\\pH=14-2.12=11.88[/tex]
Therefore, the pH of a solution is, 11.88
