Solution P has a pH of 13, solution Q has a pH of 6 and solution R has a pH of 2.
Which solution contains solute molecules as well as ions?

Answer

To determine which solution contains solute molecules as well as ions, we need to analyze the pH values of the given solutions.

### Step 1: Identify the pH values of the solutions
- Solution P has a pH of 13.
- Solution Q has a pH of 6.
- Solution R has a pH of 2.

### Step 2: Classify the solutions based on their pH
- **Solution P (pH 13)**: This is a basic solution because it has a high pH (greater than 7).
- **Solution Q (pH 6)**: This is an acidic solution, but it is weakly acidic since it is closer to neutral (pH 7).
- **Solution R (pH 2)**: This is a strongly acidic solution because it has a low pH (much less than 7).

### Step 3: Understand the dissociation of acids
- **Strong acids** (like solution R with pH 2) completely dissociate in water, meaning all the solute molecules break down into ions. Therefore, they contain only ions and no solute molecules.
- **Weak acids** (like solution Q with pH 6) do not completely dissociate. They exist in a state where some molecules remain undissociated (solute molecules) while some dissociate into ions.

### Step 4: Conclusion
Since we are looking for a solution that contains both solute molecules and ions, we conclude that:
- **Solution Q** is the correct answer because it is a weak acid and contains both undissociated acid molecules and ions.

### Final Answer:
The solution that contains solute molecules as well as ions is **Solution Q**.

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