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Types of Crystalline Solids

why does smal...

Question

why does smaller size ion give more hydration energy?

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Solution

If the size of the ion is less, the molecule has more water of crystallisation that is it accommodate more water, so its hydration energy is more. This small size molecules have less lattice energy. Hydration energy exceeds the lattice energy then the dissolution of ionic compound occur. Ex., LiCl

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Q. Why does hydration bond strength depends on atomic size?

Q. Assertion :Size of the hydrated ion is in order

L i^{+} > N a^{+} > K^{+} > R b^{+} \geq C s^{+}

which is just reverse of ionic size Reason: Greater the charge or charge density, smaller the ionic size, greater the hydration hence, greater the size of the hydrated ion.

Q. The correct statements among the following are:

I. Due to greater polarizing power of

L i^{+}

L i_{2} C O_{3}

is most stable
II.

L i H C O_{3}

does not exist as solid
III.

N a N O_{3}

on strong heating gives

N a N O_{2}

L i N O_{3}

L i_{2} O

IV. Sodium & Potassium ions are involved in the transport of sugars and amino acids into the cells
V.

L i F

is less soluble due to smaller hydration energy of

L i^{+}

M g S O_{4}

is water soluble but

B a S O_{4}

is not. Reason: The lattice energy of

B a S O_{4}

predominates over its hydration energy while in

M g S O_{4}

M g^{2 +}

being smaller in size and thus hydration energy predominates over lattice energy of

M g S O_{4}

.

Q. Assertion :The crystalline salts of alkaline earth metals contain more water of crystallization than the corresponding alkali metal salts. Reason: The size of alkaline earth metal ions is lower than the size of alkali metal ions. The lower the size of the cation, the higher is the hydration energy. So the salts of alkaline earth metals have more water molecules of crystallization than those of alkali metals.

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