Question

What is the hydronium ion concentration in an aqueous hydrobromic acid solution with a pH of 4.530?

[H3O+] = _____M?

Answer 1

2.951 × 10⁻⁵ M

Step-by-step explanation:

Let's consider the acid reaction of hydrobromic acid according to Brönsted-Lowry acid-base theory.

HBr(aq) + H₂O(l) ⇒ Br⁻(aq) + H₃O⁺(aq)

Given the pH = 4.530, we can calculate the concentration of the hydronium ion using the following expression.

pH = -log [H₃O⁺]

[H₃O⁺] = antilog -pH = antilog -4.530 = 2.951 × 10⁻⁵ M