Given an aqueous solution in which the [H⁺] = 2.5EE-7 M, what is the molar hydroxide ion concentration?

Group of answer choices

A [OH^-] = 2.5 EE-7

B [OH^-] = 2.5 EE-8

C [OH^-] = 4.0 EE-6

D [OH^-] = 4.0EE-7

E [OH^-] = 4.0EE-8

The correct option is: E) [OH^-] = 4.0EE-8

Step-by-step explanation

Given that an aqueous solution has [H⁺] = 2.5*10^-7 M

pH = - log [H⁺]

pH of the aqueous solution = - log 2.5*10^-7 = 6.602

pOH = 14 - pH

pOH of the solution = 14 - 6.602 = 7.398

The molar hydroxide ion concentration is given by;

[OH^-] = 10^-pOH

[OH^-] of the solution = 10^-7.398 = 4.0*10^-8 M = 4.0EE-8 M

The molar hydroxide ion concentration of the solution is 4.0EE-8 M

Thus,

The correct option is: E) [OH^-] = 4.0EE-8