Quantitative Analysis of Salts (VCE SSCE Chemistry): Flashcards

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Quantitative Analysis of Salts
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Water of hydration

Water molecules trapped in salt crystal structure

Hydrated salt

Salt crystal containing water molecules in its structure

Anhydrous salt

Salt without water molecules ('an-' means 'without')

Dehydration (in salts)

Heating salt to release water molecules as steam

Colour of hydrated CuSO4\text{CuSO}_4

Brilliant blue

Colour of anhydrous CuSO4\text{CuSO}_4

White

Why salts change colour when dehydrated

Changes in electron energy levels affect light absorption

Formula: mass to moles

n=mMn = \frac{m}{M}

Gravimetric analysis

Measures precipitate mass to find ion quantity via stoichiometry

Why use excess precipitating solution?

Ensures all of the target ion precipitates

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