Asolution that contains equal numbers of hydrogen and hydroxyl ions would be called

The solutions, which have both hydrogen and hydroxide ions in equal number are neutral solution.

In a solution, if the hydrogen and the hydroxide ion are in equal number, they will mask each other's effect. So, all over, the effect of the hydrogen ion or hydroxide ion would be absent. So, the solution would indicate a pH of value 7.

Hence, the given blank can be filled with neutral.

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it