Question

What is the hydrogen ion (H+) concentration of a solution of pH 8?

Answer 1

Answer:

10−8 M.

Explanation:

In this problem we are given pH and asked to solve for the hydrogen ion concentration. Using the equation, pH = − log [H+] , we can solve for [H+] as,

− pH = log [H+] ,

[H+] = 10−pH,

by exponentiating both sides with base 10 to "undo" the common logarithm. The hydrogen ion concentration of blood with pH 7.4 is,

[H+] = 10−7.4 ≈ 0.0000040 = 4.0 × In this problem we are given pH and asked to solve for the hydrogen ion concentration. Using the equation, pH = − log [H+] , we can solve for [H+] as,

− pH = log [H+] ,

[H+] = 10−pH,

by exponentiating both sides with base 10 to "undo" the common logarithm. The hydrogen ion concentration of blood with pH 7.4 is,

[H+] = 10−7.4 ≈ 0.0000040 = 4.0 × 10−8 M.

Answer 2

Answer:

$\large \boxed{10^{-8}\text{ mol/L}}$

Explanation:

pH = -log[H⁺]

$\text{[H ^{+} ]}= 10^{-\text{pH}} \text{ mol/L} = \mathbf{10^{-8}}\textbf{ mol/L}\\\text{The hydrogen ion concentration is \large \boxed{\mathbf{10^{-8}}\textbf{ mol/L}} }$