Question

Calculate the pH of a solution at 298 K with [H ] = 4.72 × 10-5 M.

Answer 1

Answer:

pH ≈ 4.33

Explanation:

The pH of a solution is a measure of its acidity, or concentration of its Hydrogen [H+] ions.

The pH scale goes from 0 to 14, with:

• 7 being neutral (like distilled water)
• >7 being basic (like soapy water)
• <7 being acidic (like lemon juice)

The pH of a solution can be found using the formula:

$\rm pH = -\!\log[H^+]$

Plugging in the given Hydrogen ion concentration, we get:

$\rm pH = -\!\log(4.72 \cdot 10^{-5}\, M)$

$\boxed{\rm pH \approx 4.33}$

This means that the solution is mildly acidic.