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?

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+

81% (166 ratings)
View Complete Written Solution
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?

Frequently Asked Questions

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 Molecular Equations concept. You can view video lessons to learn Molecular Equations. Or if you need more Molecular Equations practice, you can also practice Molecular Equations practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor You's class at UNC.