Precipitation Reactions

Common Ion Effect

The addition of concentrated hydrochloric acid to a saturated solution of sodium chloride causes solid sodium chloride to precipitate out.

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Fehling Test

When blue Fehling's reagent is added to glucose and fructose solution a brick-red precipitate forms - no rxn with sucrose.
Fehling Test

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Zinc Complex Ion Formation

Zinc ion is precipitated by sodium hydroxide. The addition of more hydroxide redissolves the precipitate.

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Copper-Ammonia Complex

Copper chloride solution forms a pale blue precipitate then a deep blue solution as ammonia is added.
Copper Hydroxide

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Aldol Clock

A solution of cinnamaldehyde and acetone suddenly turns bright yellow after induction period.
Aldol Clock

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Precipitation of Lead(II) Iodide

When lead(II) nitrate and potaasium iodide are mixed in water, students observe the formation of a bright yellow precipitate, lead(II) iodide.
Precipitation of lead(II) iodide

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