The enthalpy of solution of `NaOH(s)` in water is `-41.6 kJ//"mole"` When `NaOH` is dissolved in water then the temperature of water:

Options

A. Increase
B. Decrease
C. Does not change
D. Fluctuates

Answer

To solve the problem regarding the enthalpy of solution of NaOH in water, we can follow these steps:

### Step 1: Understand the given data
The enthalpy of solution of NaOH(s) in water is given as -41.6 kJ/mole. This indicates that when NaOH dissolves in water, it releases energy.

**Hint:** Remember that the sign of enthalpy change indicates whether heat is absorbed or released during the process.

### Step 2: Identify the type of reaction
Since the enthalpy change is negative (-41.6 kJ/mole), this indicates that the dissolution of NaOH in water is an exothermic reaction. In exothermic reactions, heat is released into the surroundings.

**Hint:** Exothermic reactions are characterized by a negative enthalpy change, meaning they release heat.

### Step 3: Determine the effect on temperature
When NaOH dissolves in water and releases heat, the temperature of the solution will increase. This is because the heat released from the dissolution process is absorbed by the water, raising its temperature.

**Hint:** In exothermic reactions, the temperature of the surroundings (in this case, the water) increases due to the release of heat.

### Step 4: Conclusion
Based on the analysis, we conclude that when NaOH is dissolved in water, the temperature of the water will increase.

**Final Answer:** The temperature of the water increases.