Students are required to keep a neat and accurate record of their laboratory observations. Upon the test of Cadmium ion, a black precipitate was obtained rather than a yellow precipitate. What may have caused the blackening of the precipitate?

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ISBN:9781133611097
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Chapter4: Types Of Chemical Reactions And Solution Stoichiometry
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Problem 18Q: When 1.0 mole of solid lead nitrate is added to 2.0 moles of aqueous potassium iodide, a yellow...
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Students are required to keep a neat and accurate record of their laboratory observations. Upon the test of Cadmium ion, a black precipitate was obtained rather than a yellow precipitate. What may have caused the blackening of the precipitate?

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