Chapter 14.4, Problem 14.10P

Interpretation Introduction

Interpretation:

In a neutral solution, at $\text{50°C}$ the concentrations of ${\text{H}}_{\text{3}}{\text{O}}^{+}$ and ${\text{OH}}^{\text{-}}$ has to be calculated and the solution has to be classified as acidic, basic or neutral.

Concept introduction:

Ion-product constant value$\left(K_w\right)$:

At $\text{25°C}$ we can calculate the numerical value of ${\text{K}}_{\text{w}}$:

${\text{K}}_{\text{w}}\text{=}\left[{\text{H}}_{\text{3}}{\text{O}}^{\text{+}}\right]\left[{\text{OH}}^{\text{-}}\right]$

If $\left[{\text{OH}}^{\text{-}}\right]\text{=}\left[{\text{H}}_{\text{3}}{\text{O}}^{\text{+}}\right]$, then $\left[{\text{OH}}^{\text{-}}\right]$ is square root of ${\text{K}}_{\text{w}}$.