Answer:
a) Not acidic
b) Not acidic
Explanation:
To determine if a solution is acidic, we need to calculate the pH. If the pH < 7, the solution is acidic.
a) A solution with [H₃O⁺] = 2.5 × 10⁻⁸ M
We will use the following expression.
pH = -log [H₃O⁺] = -log 2.5 × 10⁻⁸ = 7.6
Since the pH > 7, the solution is not acidic
b ) A solution with [OH⁻] = 1.0 × 10⁻⁷M
First, we will calculate the pOH.
pOH = -log [OH⁻] = -log 1.0 × 10⁻⁷ = 7.0
Then, we will calculate the pH.
pH = 14.0 - pOH = 14.0 - 7.0 = 7.0
Since the pH is 7, the solution is not acidic.
