Ice and water are placed in a closed container at a pressure of 1 atm and 273.15 K temperature . If pressure of the system is increased by 2 atm keeping temperature constant the correct observation would be

Options

A. The liquid phase disappears completely
B. The amount of ice increases
C. The solid phase (ice) disappears completely
D. Volume of the system increases

Answer

To solve the problem, we need to analyze the situation involving ice and water in a closed container at a specific temperature and pressure. Here's a step-by-step breakdown of the solution:

### Step 1: Understand the Initial Conditions
- We have ice and water in equilibrium at 1 atm pressure and 273.15 K (0°C). At this temperature, ice and water coexist in equilibrium.

**Hint:** Remember that at 0°C, ice and water are in a state of equilibrium, meaning they can convert into each other without any net change in their amounts.

### Step 2: Apply Le Chatelier's Principle
- According to Le Chatelier's Principle, if an external change is applied to a system at equilibrium, the system will adjust to counteract that change.
- In this case, we are increasing the pressure by 2 atm while keeping the temperature constant.

**Hint:** Consider how changes in pressure affect the equilibrium position of reactions involving gases or solids and liquids.

### Step 3: Analyze the Effect of Increased Pressure
- Ice (solid) has a greater volume than water (liquid). When pressure is increased, the equilibrium will shift towards the phase with the lower volume to minimize the effect of the pressure increase.
- Since water has a lower volume than ice, the equilibrium will shift towards the formation of more water.

**Hint:** Think about which phase (solid or liquid) occupies more space and how that relates to pressure changes.

### Step 4: Determine the Observations
- From the analysis, we can conclude that:
- The liquid phase (water) will not disappear completely; it will actually increase.
- The amount of ice will decrease as it converts to water.
- The solid phase (ice) will disappear completely as the pressure increases and the equilibrium shifts towards the liquid phase.
- The overall volume of the system will not increase; it will decrease due to the conversion of ice to water.

**Hint:** Reflect on the implications of the equilibrium shift and how it affects the phases present in the system.

### Conclusion
- The correct observation when the pressure is increased by 2 atm is that the solid phase (ice) will disappear completely as it converts to water.

**Final Answer:** The solid phase disappears completely.