Problem: The accompanying photo shows the reaction between a solution of Cd(NO3)2 and one of Na2S. What is the identity of the precipitate?

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FREE Expert Solution

Reactants:

• Na2S

▪ sodium → group 1A → +1 charge → K+ 

▪ sulfide → group 6A → -2 charge → S2-


• Cd(NO3)2

▪ nitrate → polyatomic ion → -1 charge → NO3- 

            Salt is neutral → overall charge = 0

            Overall charge = Cd + NO3- 
            0 = Cd + (-1 x 2)
            0 = Cd + (-2)
            +2 +2
            Cd = +2

▪ cadmium → +2 charge → Ni2+

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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.

What is the identity of the precipitate?

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