Heat of neutralization of strong acid and weak base is

Options

A. 57.1 kJ `mol^(-1)`
B. 13.7 kJ `mol^(-1)`
C. Less than 13.7 kcal `mol^(-1)`
D. More than 13.7 kcal `mol^(-1)`

Explanation

To determine the heat of neutralization of a strong acid with a weak base, we can follow these steps:

### Step 1: Understand the Concept of Heat of Neutralization
The heat of neutralization is the amount of heat released when an acid reacts with a base to form water and a salt. This process is typically exothermic, meaning it releases heat.

### Step 2: Identify the Types of Acids and Bases
In this case, we are dealing with a strong acid (like HCl or H2SO4) and a weak base (like NH3 or CH3COONa).

### Step 3: Know the Standard Values
The heat of neutralization for a strong acid with a strong base is approximately -57.3 kJ per mole. However, when a strong acid reacts with a weak base, the heat of neutralization is slightly different due to the additional energy required to ionize the weak base.

### Step 4: Calculate the Heat of Neutralization for Strong Acid and Weak Base
For a strong acid reacting with a weak base, the heat of neutralization is approximately -17.7 kJ per gram equivalent. This value reflects the energy lost during the reaction, which is greater than that of a strong acid with a strong base due to the energy consumed in ionizing the weak base.

### Step 5: Conclusion
Thus, the heat of neutralization of a strong acid with a weak base is -17.7 kJ per gram equivalent.

### Final Answer
The heat of neutralization of a strong acid and weak base is approximately -17.7 kJ per gram equivalent.

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