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Ethanolic acid is a weak acid - OCR Gateway - GCSE Chemistry: Combined Science - Question 3 - 2018 - Paper 1
Question 3
Ethanolic acid is a weak acid. What is the pH of ethanoic acid? A 1 B 5 C 7 D 12
Worked Solution & Example Answer:Ethanolic acid is a weak acid - OCR Gateway - GCSE Chemistry: Combined Science - Question 3 - 2018 - Paper 1
Step 1
What is the pH of ethanoic acid?
Answer
Ethanoic acid (acetic acid) is classified as a weak acid due to its partial dissociation in solution. The pH of weak acids typically ranges between 4 and 6, depending on their concentration in solution.
Given the options presented:
- Option A (1): This would indicate a strong acid.
- Option B (5): This is consistent with a weak acid.
- Option C (7): This represents a neutral pH.
- Option D (12): This would indicate a strong base.
Since ethanoic acid does not fully dissociate, the correct pH for a typical concentration of ethanoic acid is 5. Therefore, the answer is B.