Question

2. Why do ionic substances with higher lattice energies tend to be less soluble in water than substances with lower lattice energies? 3. Which would you expect to have the larger hydration energy, SO or CIOA? Explain. 4. Ethyl alcohol, CH CH2OH, is miscible with water at 20°C, but pentyl alcohol, CH3CH2CH2CH2CH2OH, is soluble in water only to the extent of 2.7 g/100 ml. Explain.

Answer 1

. It is the amount of energy required Lattice Energy - It is the amoun to separate the crystals into gaseous ions. Hydration Energy; - It is the amount of energy when one mole of lons undergo hydration, released And (2) For any lonic compound to be soluble, there are two main governing factor ci) lattice energy (ii) hydration energy. → If hydration enogy is greater then lattice energy, Ponic compound is soluble If hydration energy is less than lattice energy - lonic compound is less soluble of ionic compounds with higher lattice energy tend to be less soluble in water because the energy released via hydration of ionic compound is not sufficient to apart the ions of ionic compounds into gaseous phase Eu 3 Size is the governing factor to decide the hydration energy Smaller ions have stronger attraction and therefore higher is the hydration energy. Charge on the ion is also main factor if the charge o is high, more attraction occurs between ions and more is the hydration energy OY

In 50c2- and clot; the hydration enougy of Soul is higher than that of cle because 504² has less size and higher charge than that of clou Ans. Ethyl alcohol is more soluble than that of pantil alcohol because water is polar and it abract -oh group of Ethyl group and soluble.. But to in the case of pentyl alcohol, pentyl gp being non-polar, dominant factor is the solubilh of pentyl alcohol. That's why pentyl alcohol is less soluble in water as compared to the ethyl alcohol.