Answer : The hydroxide ion concentration of a solution is, [tex]3.8\times 10^{-7}M[/tex]
Explanation :
As we know that:
pH : It is defined as the negative logarithm of hydrogen ion concentration.
Mathematically,
[tex]pH=-\log [H^+][/tex]
Similarly,
pOH : It is defined as the negative logarithm of hydroxide ion concentration.
Mathematically,
[tex]pOH=-\log [OH^-][/tex]
Given:
pOH = 6.42
[tex]6.42=-\log [OH^-][/tex]
[tex][OH^-]=3.8\times 10^{-7}M[/tex]
Therefore, the hydroxide ion concentration of a solution is, [tex]3.8\times 10^{-7}M[/tex]
