Question

A solution has a [H3O+] of 1 × 10−5 M. What is the [OH−] of the solution?

A) 9 M
B) 14 M
C) 1 x 10^{-9}
D) 1 x 10^{-14}

Answer 1

The [OH-] of the solution is 1 x 10^-9 M.

Step-by-step explanation:

The concentration of hydronium ions ([H3O+]) in a solution is related to the concentration of hydroxide ions ([OH-]) by the equation: [H3O+] * [OH-] = 1.0 x 10^(-14) M^2. Since the concentration of hydronium ions is given as 1 x 10^(-5) M, we can solve for the concentration of hydroxide ions as follows:

[OH-] = 1.0 x 10^(-14) M^2 / [H3O+]

Substituting the given value, we have:

[OH-] = 1.0 x 10^(-14) M^2 / (1.0 x 10^(-5) M) = 1.0 x 10^(-9) M

Therefore, the [OH-] of the solution is 1 x 10^(-9) M (Option C).