Answer to Question #350884 in Chemistry for mica

Question

Determine the pH of a 0.020 M HNO₃ 

Answer 1

Solution:

Nitric acid (HNO₃) is a strong acid because it dissociates almost completely.

Nitric acid dissociates as follows:

HNO₃(aq) + H₂O(l) → H₃O⁺(aq) + NO₃⁻(aq)

This means that the concentration of hydronium ions (H₃O⁺) will be equal to that of the nitric acid:

[H₃O⁺] = [HNO₃] = 0.020 M

We can convert between [H₃O⁺] and pH using the following equation:

pH = −log[H₃O⁺]

pH = −log(0.020) = 1.699 = 1.70

In this case, the pH of the solution will be 1.70

Answer: pH = 1.70