Description of experiment
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Needed compounds:
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sulphuric acid : H2SO4
sodium carbonate : Na2CO3 . 10H2O
silver nitrate : AgNO3
Class:
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elem=Ag
precipitation
Summary:
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Silver (I) gives a pale yellow precipitate with carbonates.
Description:
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Add a solution of Na2CO3.10H2O to a solution of silver nitrate: A pale
yellow precipitate is formed, which quickly sinks to the bottom of the
test tube, where it builds a voluminous pale yellow / off white layer.
Add some dilute sulfuric acid: The precipitate dissolves and a gas is
evolved (CO2). The liquid becomes almost clear, a faint turbidity remains.
Is this due to low solubility of silver sulfate or due to impurities in
the sulphuric acid (traces of chlorides)?