Respuesta :
Answer: The hydroxide ion concentration is [tex]1.26\times 10^{-4}M[/tex]
Explanation:
pOH is defined as the negative logarithm of hydroxide ion concentration in the solution.
To calculate the pOH of the reaction, we use the equation:
[tex]pOH=-\log[OH^-][/tex]
where,
[tex]pOH=3.90[/tex]
Putting values in above equation, we get:
[tex]3.90=-\log[OH^-][/tex]
[tex][OH^-]=1.26\times 10^{-4}M[/tex]
Hence, the hydroxide ion concentration is [tex]1.26\times 10^{-4}M[/tex]
