What is the effect of the addition of sugar on the boiling and freezing points of water?

Options

A. Both boiling point and freezing point increases
B. Both boiling point and freezing point decreases
C. Boiling point increases and freezing point decreases
D. Boiling point decreases and freezing point increases

Answer

To determine the effect of the addition of sugar on the boiling and freezing points of water, we can analyze the properties of solutions and the behavior of solutes when dissolved in solvents. Here’s a step-by-step solution:

### Step 1: Understanding the Concepts
When a solute (like sugar) is added to a solvent (like water), it affects the physical properties of the solvent. Two important properties affected are the boiling point and the freezing point.

**Hint:** Recall that the addition of a solute to a solvent alters its physical properties.

### Step 2: Boiling Point Elevation
The boiling point of a solution is higher than that of the pure solvent. This phenomenon is known as boiling point elevation. When sugar is dissolved in water, the boiling point of the resulting solution increases.

**Hint:** Remember that boiling point elevation is a colligative property, which depends on the number of solute particles in the solution.

### Step 3: Freezing Point Depression
Conversely, the freezing point of a solution is lower than that of the pure solvent. This is referred to as freezing point depression. When sugar is added to water, the freezing point of the solution decreases.

**Hint:** Freezing point depression is also a colligative property and is influenced by the concentration of the solute.

### Step 4: Conclusion
From the above analysis, we can conclude that the addition of sugar to water results in:
- An increase in the boiling point (boiling point elevation).
- A decrease in the freezing point (freezing point depression).

Thus, the correct answer to the question is that the boiling point increases and the freezing point decreases.

**Final Answer:** Boiling point increases and freezing point decreases.

**Correct Option:** Option 3.