Question

What is the best description for a solution with a hydroxide-ion concentration equal to 1 x 10-4m?

Answer 1

The solution is basic

Step-by-step explanation:

Given:

Concentration of OH- = 1*10⁻⁴ m

To determine:

The nature of the solution i.e. acidic or basic

Formula:

A solution where the pH = 7 is neutral

pH < 7 is acidic

pH > 7 is basic

`p[OH] = -log[OH-] = -log[1*10^(-4)] = 4\\ \\p[H] + p[OH] = 14\\\\Therefore\ pH = 14 - p[OH] = 14 - 4 = 10`

Since, pH > 7, the solution is basic

Answer 2

Basic solution.

Step-by-step explanation:

∵ pOH = -log[OH⁻] = - log(1.0 x 10⁻⁴) = 4.

∵ pH + pOH = 14.

∴ pH = 14 - pOH = 14 - 4 = 10.

Since, the pH of the solution is 10 (> 7) and the concentration of [OH⁻] is 1.0 x 10⁻⁴ (> 1.0 x 10⁻⁷) is a basic solution.