CHEMISTRY
JAMB 2008 - Question 18
Chemistry 2008 JAMB Past Questions - Question 18: What is the pH of a 0.001 mol dm-³ solution of sodium hydroxide?
Choose the correct answers from the options given.
A:
B:
C:
D:
Correct Answer
D
Explanation
The pH of a 0.001 mol dm-³ solution of sodium hydroxide is approximately 11.00.
Here's how we can calculate it:
1. **Sodium hydroxide (NaOH) is a strong base, meaning it completely dissociates in water to form Na+ and OH- ions.** This means that the concentration of OH- ions in the solution is equal to the concentration of NaOH, which is 0.001 mol dm-³.
2. **We can use the pOH formula to calculate the pOH of the solution:**
pOH = -log[OH-]
pOH = -log(0.001) = 3
3. **We can use the relationship between pH and pOH to calculate the pH of the solution:**
pH + pOH = 14
pH = 14 - pOH = 14 - 3 = 11
Therefore, the pH of the solution is approximately 11.00.
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