Answer :
Answer: 4.32 X [tex]10^{^{-11}}[/tex]
Explanation: Given concentration of hydroxide ions = 2.31 x [tex]10^{^{-4}}[/tex]
As we know that Kw ( ionic product of water) at 25 °C = [tex]10^{^{-14}}[/tex]
and Kw is the product of concentration of hydronium ions and hydroxide ions.
Thus,
Kw = [tex]H_{_{3}}O^{^{+}}[/tex] [tex]OH^{^{^{-}}}[/tex]
[tex]10^{^{-14}}[/tex] = [tex]H_{_{3}}O^{^{+}}[/tex] X 2.31 x [tex]10^{^{-4}}[/tex]
[tex]10^{^{-14}}[/tex] / 2.31 x [tex]10^{^{-4}}[/tex] = [tex]H_{_{3}}O^{^{+}}[/tex]
[tex]H_{_{3}}O^{^{+}}[/tex] = 4.32 X [tex]10^{^{-11}}[/tex]
Thus, the concentration of hydronium ions in a solution = 4.32 X [tex]10^{^{-11}}[/tex]