Which base is the strongest for the given [h+]? 10-9 10-11 10-10 10-12

[H⁺] =  10⁻¹²

It could be the strongest base.

Explanation:

The base is considered to be of highest strength if it has least hydrogen ion concentration or high hydroxide ion concentration.

Generally a stronger base gives more hydroxide ion concentration.

the relation between hydrogen ion and hydroxide ion concentration is

[H⁺][OH⁻]= 10⁻¹⁴

[OH⁻] = 10⁻¹⁴  /  [H⁺]

a) [H⁺] =  10⁻⁹

[OH-] = 10⁻⁵

b) [H⁺] =  10⁻¹¹

[OH-] = 10⁻³

c) [H⁺] =  10⁻¹⁰

[OH-] = 10⁻⁴

d) [H⁺] =  10⁻¹²

[OH-] = 10⁻²

This the highest concentration of hydroxide ion in the given choices so it could be the strongest base.