Why should hydration energy be greater than lattice energy?

If the hydration energy is greater than the lattice energy, then the enthalpy of solution is negative (heat is released), otherwise it is positive (heat is absorbed). If the solvation energy is positive, then the solvation process is endergonic; otherwise, it is exergonic.

How does lattice enthalpy and hydration enthalpy affect solubility?

If there is a net release of energy, that is, if more energy is released on hydration than is stored in the ionic solid lattice, then solubility is favored. If there is a net gain of energy, that is, if less energy is released on hydration than is stored in the ionic solid lattice, then solubility is unfavored.

What is the relation between lattice enthalpy and hydration enthalpy?

Hint: As we know that, the lattice enthalpy of a crystalline solid is a measure of the energy released when ions are combined to make a compound. Hydration enthalpy is the amount of energy released when one mole of ions undergo hydration….

Compound	Lattice enthalpy (kJ/mol)	Hydration enthalpy (kJ/mol)
S	+632	-600

Why does hydration enthalpy decrease with increase in ionic size?

The size of the hydration enthalpy is governed by the amount of attraction between the ions and the water molecules. The attractions are stronger the smaller the ion. In both groups, hydration enthalpy falls as the ions get bigger. The attractions are stronger the more highly charged the ion.

What is difference between lattice energy and hydration energy?

Key Difference – Lattice Energy vs Hydration Energy Lattice energy is the amount of energy that is released when a lattice is formed. Hydration energy is the energy that is released when the lattice is dissolved in water.

Why lattice enthalpy decreases down the group?

As we move down the group, the lattice energy decreases. This is due to the fact that with the increase in the size of ions, the distance between their nuclei increases. Therefore, decreasing the attraction between them and finally, less lattice energy released during the process.

Why does hydration energy decreases down the group?

Smaller the ion, the higher the hydration enthalpy will be because smaller atoms can accommodate a large number of water molecules around it and get hydrated. Hydration enthalpy decreases down the group the size of the atom increases due to the addition of extra valence shells.

What is the difference between hydration energy and hydration enthalpy?

Hydration is a special type of dissolution of ions in water. Enthalpy of hydration or the hydration energy is the energy that is released when ions are dissolved in water. The hydration is hence an exothermic reaction. That is because the dissolution of ions creates interactions between ions and water molecules.

What is the difference between hydration enthalpy and lattice energy?

Lattice energy is energy required to break bond between oppositely charged ions . Hydration enthalpy is energy released when separated ions are dissolved in water. Thus breaking of ionic bond requires energy while dissolution of ions releases energy.

What is the effect of enthalpy of hydration on dissolution of ionic compounds?

For dissolution of ionic compounds, if the hydration enthalpy is more than lattice enthalpy, ample amount of energy will be available to saparate more ions because energy evolved during hydration is more than energy required for saparation. Thus, change will be triggered and dissolution will occur.

How does lattice enthalpy affect the force of attraction between ions?

The greater the lattice enthalpy, the stronger the forces. Those forces are only completely broken when the ions are present as gaseous ions, scattered so far apart that there is negligible attraction between them. You can show this on a simple enthalpy diagram.

What is the energy of dissolution of a lattice?

The energy of dissolution is equal to the sum of lattice energy and hydration energy. That is because, in order to dissolve a lattice in water, the lattice should undergo dissociation and hydration. The lattice should be provided with an amount of energy that can dissociate the lattice into ions. This is equal to the lattice energy.