Question

What is the pH of a 1.0 x 10-5 M solution of sulfric acid

Answer 1

Answer:

pH = 4.7

Explanation:

The pH is a measurement of acidity using the concentration of hydrogen ions (H⁺) in a solution. Therefore, before you can find the pH, you need to determine the concentration (M) of H⁺ in the solution. This can be done by multiplying the molarity of the solution by the amount of H⁺ in the solution.

1 mole H₂SO₄ = 2 moles H⁺ and 1 mole SO₄⁻

1.0 x 10⁻⁵ M H₂SO₄           2 moles H⁺
-----------------------------  x  ----------------------  =  2.0 x 10⁻⁵ M H⁺
                                        1 mole H₂SO₄

To find the pH, you need to use the following equation:

pH = -log[H⁺]

Since you calculated the hydrogen concentration ([H⁺]) in the previous step, you can plug it into the equation and solve.

pH = -log[H⁺]

pH = -log[2.0 x 10⁻⁵]

pH = 4.7