Li ion is a smaller cation than K ion. which of the two has the higher hydration energy?explain
Answers
Answer:
Enthalpy of hydration is the heat energy released when new bonds are made between the ions and water molecules. The hydration enthalpy is the enthalpy change when 1 mole of gaseous ions dissolve in sufficient water to give an infinitely dilute solution. Hydration enthalpies are always negative.
M
z+
(g)+mH
2
O→M
z+
(aq)
Where M
z+
(aq) represents ions surrounded by water molecules and dispersed in the solution. As the atomic numbers increases, so do the ionic size, leading to a decrease in absolute values of enthalpy of hydration.
Smaller the cation, greater is the degree of hydration. Alkali metals easily lose 1 electron and therefore have high values of "oxidising potential" which means high tendency to get oxidised and hence, powerful reducing nature in aqueous medium. Since Li
+
is small in size among all alkali metals, it has high charge density and hence, the highest hydration energy of all the alkali metals.
Explanation:
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Answer:
Li+ has maximum degree of hydration enthalpy ....
Explanation:
Degree of hydration depend on the size of ion, higher will be the hydration and hence the value of hydration energy will also be high .
In group 1 elements ,the size of Li+ is minimum so it's hydration energy is maximum...