Zinc carbonate changes from white to yellow, but as it cools it changes back to white.
Sulphates produce a precipitate with Barium Chloride solution:
Add dilute HCL to your substance, then barium chloride solution. If a white precipitate was formed, your substance was a sulfate.
Halides (chlorine, bromine and iodine) produce a precipitate with silver nitrate:
Add acidified silver nitrate (nitric acid and silver nitrate) to a substance.
A white precipitate means it was a chloride Cl- (think Clouds are white)
A cream precipitate means it was a bromide Br- (think cream is cold Brrrrrrr!)
A yellow precipitate means it was an iodide I- (think eyes (I) are yellow. I know it makes no sense...)
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