Which of the following is not a correct statement about an ionic compound

Options

A. The higher the temperature, the more the solubility
B. The higher the dielectric constant of the solvent, the more the solubility
C. the higher the dipole moment of the solvent, the more the solubility
D. The higher the lattice energy, the more the solubility

Answer

To determine which statement about ionic compounds is incorrect, let's analyze each statement step by step.

### Step 1: Analyze the first statement
**Statement:** The higher the temperature, the more the solubility.

**Explanation:** This statement is correct. As temperature increases, the kinetic energy of the particles also increases, which helps to break the ionic lattice structure of the compound. This allows more ions to become free, thus increasing solubility.

### Step 2: Analyze the second statement
**Statement:** The higher the dielectric constant of a solvent, the more the solubility.

**Explanation:** This statement is also correct. A higher dielectric constant means that the solvent can better stabilize the ions that are formed when an ionic compound dissolves. This leads to increased solubility as the ions are more easily separated and solvated.

### Step 3: Analyze the third statement
**Statement:** The higher the dipole moment of the solvent, the more the solubility.

**Explanation:** This statement is correct as well. A solvent with a higher dipole moment can better interact with and solvate the ions of the ionic compound. This interaction increases the solvation energy, which contributes to higher solubility.

### Step 4: Analyze the fourth statement
**Statement:** The higher the lattice energy, the more the solubility.

**Explanation:** This statement is incorrect. Higher lattice energy indicates that the ionic bonds in the compound are stronger, making it more difficult for the compound to dissociate into free ions. If the lattice energy is high, it means that the energy required to break the lattice is also high, which can hinder solubility. For a compound to be soluble, the solvation energy must exceed the lattice energy.

### Conclusion
Based on the analysis, the incorrect statement about ionic compounds is:
**Answer:** The higher the lattice energy, the more the solubility.

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