Which of the following is the weakest acid?
Correct answer: A. CH3COOH
- A. CH3COOH
- B. CICH2COOH
- C. Cl2CHC00H
- D. Cl3CCOOH
Explanation
Option A is correct.The weakest acid among the given options is CH3COOH or acetic acid. Acetic acid has a pKa value of 4.76, which is the lowest among the given acids. The pKa value is a measure of the acidity of a molecule. A lower pKa value means that the molecule is more acidic. The other acids have the following pKa values: CICH2COOH: pKa = 2.86 Cl2CHCOOH: pKa = 2.78 Cl3CCOOH: pKa = 2.67 As you can see, the pKa values of the other acids are lower than the pKa value of acetic acid. This means that the other acids are more acidic than acetic acid. Acetic acid is a weak acid because it does not ionize completely in water. Only about 1% of the acetic acid molecules in a solution will ionize. The rest of the acetic acid molecules will remain in the form of molecules.
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