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Problem: The accompanying photo shows the reaction between a solution of Cd(NO3)2 and one of Na2S. Is this a redox reaction?

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Recall the mnemonic for redox reactions:

Loss Electrons → Oxidation → Reducing Agent

Gain Electrons → Reduction → Oxidizing Agent


Cd(NO3)2 and one of Na2S

Nitrates (NO3-), Acetates (CH3COO- or C2H3O2-), and most Perchlorates (ClO4-) are soluble
Sulfides (S2-) are insoluble except when with Group 1A ions (Li+, Na+, K+, etc.) and ammonium ion (NH4+) and Ca2+, Sr2+, Ba2+

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Problem Details

The accompanying photo shows the reaction between a solution of Cd(NO3)2 and one of Na2S

Liquid from a graduated cylinder is being poured into a beaker containing a liquid, forming a cloud, yellowish precipitate.

Is this a redox reaction?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Redox Reactions concept. If you need more Redox Reactions practice, you can also practice Redox Reactions practice problems.