Determine the hydroxide ion concentration in a solution that is 0.018 m naoh.

As we know, NaOH is a strong Base and completely dissociates in water as given below,

NaOH + H₂O → Na⁺ ₍aq₎ + OH⁻ ₍aq₎

So, the concentration of OH⁻ Ions will be the same as that the concentration of NaOH i. e. 0.018 M.

So,

[OH⁻] = 0.018 M