What is the pH of an aqueous ammonia solution if its pOH is 3.20?

• A. 7.00
• B. 3.20
• C. 14.00
• D. 10.80

Answer: (D)

Verified step by step guidance

1. Recall the relationship between pH and pOH in aqueous solutions at 25°C, which is given by the equation: \(\mathrm{pH} + \mathrm{pOH} = 14.00\).
2. Identify the given value in the problem, which is the pOH of the ammonia solution: \(\mathrm{pOH} = 3.20\).
3. Substitute the given pOH value into the equation to find the pH: \(\mathrm{pH} = 14.00 - \mathrm{pOH}\).
4. Perform the subtraction to express the pH in terms of the given pOH: \(\mathrm{pH} = 14.00 - 3.20\).
5. Interpret the result as the pH of the ammonia solution, which indicates the basicity of the solution since ammonia is a weak base.