WAEC Chemistry 2022 Objective — Question 3
Question 3 of 50 from the West African Examinations Council (WAEC) Chemistry 2022 Objective paper, with the correct answer and a full explanation.
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The cleansing effect of soap is low in acidic water because of the
- A. formation of unionized fatty acidCorrect
- B. increase in the pH of the soap molecules
- C. anti-biodegradable effect of hydrogen ions
- D. hardness of the acidic water
Explanation
In acidic water, hydrogen ions react with the soap's long-chain fatty acid anions to form unionized (insoluble) fatty acids, reducing the amount of soap available for cleaning.
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