Answer:
[tex]\huge\boxed{\sf OH-}[/tex]
Explanation:
According to Arrhenius concept of acid and base:
"When a base in a solution, produces/yields OH- (Hydroxide) ions."
So, when a base is dissolved in a solution, it produces OH- ions.
For example:
NaOH ⇄ Na⁺ + OH⁻ (So, it is a base)
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807
