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Hydrated Copper (II) Sulphate is heated in a boiling tube as shown.

i).State the color of Copper (II) Sulphate before and after heating?
ii).Explain why the boiling tube was slanted
iii).How can the purity of the colorless liquid be confirmed?
iv).Name another substance that can undergo the same change as hydrated Copper (II) Sulphate

Answer Text:
i).Before – blue/ after – white
ii).Avoid boiling tube cracking due to condensed water flowing back
iii).Test its Boiling point/Melting point/density
iv).Any hydrated salt.