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Electrolytes

Why hydration...

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Why hydration order Li+> K+> Na+ What is hydration enthalpy?

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Q. The correct order for the hydration energy of

L i^{+}

N a^{+}

C s^{+}

Q. The lattice enthalpy of solid

N a C l

772 k J {m o l}^{- 1}

and enthalpy of solution is

2 k J {m o l}^{- 1}

. If the hydration enthalpy of

{N a}^{+}

{C l}^{-}

ions are in the ratio of

3 : 2.5

, what is the enthalpy of hydration of chloride ion?

Q. What is hydration enthalpy?

Hydration energy ${Δ H}_{h y d r a} . (k J m o l^{- 1})$	Lattice energy $Δ H_{u} (k J m o l^{- 1})$
$L i^{+}$ -499	LiCl-840
$N a^{+}$ -390	NaCl-776
$K^{+}$ -305	KCl-703
$C l^{-}$ -382

Which salt has maximum heat of hydration?

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.

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