Enthalpy Change of Solution

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5 Terms

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What is the standard enthalpy change of solution?

The enthalpy change when one mole of an ionic compound dissolves in water under standard conditions.

e.g.

NaCl (s )→ Na+(aq) +Cl−(aq)

2
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What must happen in order for an ionic substance to dissolve?

  • The ionic lattice breaks down into gaseous ions (endothermic).

  • New bonds must form between the solvent and the ions i.e. the ions become hydrated (exothermic).

3
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What is the standard enthalpy of hydration?

The enthalpy change that occurs when one mole of aqueous ions are formed from their gaseous ions under standard conditions.

4
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Hydration is an…

Exothermic process.

5
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How do you calculate the enthalpy change of solution?

Using Hess’s Law.

The enthalpy of solution= enthalpy of lattice dissociation + enthalpy of hydration.