Step 1. Understanding the Question

We are asked to find the van’t Hoff factor (i) for acetic acid (CH₃COOH) dissolved in water.

The van’t Hoff factor indicates the number of particles produced in solution compared to the number initially dissolved.

Step 2. Concept of van’t Hoff Factor The van’t Hoff factor 𝑖 is given by:

Step 3. Ionization of Acetic Acid

Acetic acid is a weak electrolyte, so it ionizes partially in water as:

If ionization were complete, there would be 2 particles formed per molecule, so 𝑖 = 2.

But because ionization is partial, the actual value of 𝑖 lies between 1 and 2.

✅ Final Answer: The value of van’t Hoff factor 𝑖 for CH₃COOH in water is between 1 and 2.

Correct Option: 1)