Question

Calculate the [H3O+] value of each aqueous solution.milk of magnesia with [OH−]=1.4×10−5M .Express your answer using two significant figures.

Answer 1

Answer:

[H3O (+)] = 7.1 x 10⁻¹⁰ M.

Explanation:

To solve this problem, we have to use the following equation:

$\lbrack H_3O^+]\lbrack OH^-]=1\cdot10^{-14}.$

As we have the value of [OH (-)], we just have to solve for [H3O (+)] and replace the data that we have, like this:

$\begin{gathered} \lbrack H_3O^+]=\frac{1\cdot10^{-14}}{\lbrack OH^-]}=\frac{1\cdot10^{-14}}{1.4\cdot10^{-5}}, \\ \lbrack H_3O^+]=7.1\cdot10^{-10}\text{ M.} \end{gathered}$

The answer would be that the concentration of [H3O (+)] = 7.1 x 10⁻¹⁰ M.