Description of experiment
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Needed compounds:
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hydrogen peroxide : H2O2
hydrochloric acid : HCl
potassium dichromate : K2Cr2O7
stannous chloride : SnCl2
Class:
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elem=Sn,Cr
redox
Summary:
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Dichromate is quickly reduced by tin (II) ions.
Hydrogen peroxide does not show a visible reaction with tin (II) ions.
Description:
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Sequence 1:
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Add some tin chloride to distilled water: The solid quickly dissolves, the
liquid becomes turbid.
Add some HCl (appr. 10% by weight): The turbidity almost disappears, the
liquid becomes almost clear and colorless. A slight white turbidity remains.
Add a solution of potassium dichromate: The liquid becomes green with a blue
hue.
Sequence 2:
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Add some tin chloride to distilled water: The solid quickly dissolves, the
liquid becomes turbid.
Add some HCl (appr. 10% by weight): The turbidity almost disappears, the
liquid becomes almost clear and colorless. A slight white turbidity remains.
Add a solution of hydrogen peroxide (appr. 6% by weight): No visible reaction.