Question

If a muriatic acid solution has a pH of 2.50, what is the hydronium ion concentration (hydronium ion concentration is also the muriatic acid concentration)?

With a pH of 2.50, the hydronium ion concentration is _____________________

Answer 1

• [H₃O⁺] = 0.032 M

Step-by-step explanation:

The acidity of a solution is measured by its pH, which is the logarithm of the inverse of the molar concentration of hydronium (H₃O⁺) ions:

• pH = log 1 / [H₃O⁺] = - log [H₃O⁺]

When you know the pH value you can find hydronium concentration using the antilogaritm function:

`pH=-log[H_3O^(+)]\\ \\ {[H_3O^+]}=10^(-pH)\\ \\ {[H_3O^+]}=10^(-2.50)\\ \\ {[H_3O^+]}=0.0032`

The unit of molar concentration is M.

To prove your answer you can take the logarithm of 0.0316:

• log (0.0032) ≈ 2.500