Solution: Which of the following reagents could be used to separate the two cations from a solution containing Cobalt (I) nitrate and sodium hydroxide? a) Ca(C2H3O2)2b) Sc(NO3)3c) BaCO3d) LiClO4e) NaNO3

Problem

Which of the following reagents could be used to separate the two cations from a solution containing Cobalt (I) nitrate and sodium hydroxide?

 

a) Ca(C2H3O2)2

b) Sc(NO3)3

c) BaCO3

d) LiClO4

e) NaNO3

Solution

Cations are positively charged ions. The cations in the solution can be separated by precipitating one out. We will refer to the solubility rules in order to determine which cation will form an insoluble salt (precipitate) with the given reagents.

Solubility Rules:

Soluble Ionic Compounds:

 Group 1A ions (Li+, Na+, K+, etc.) and Ammonium ion (NH4+) are soluble
Nitrates (NO3-), Acetates (CH3COO- or C2H3O2-), and most Perchlorates (ClO4-) are soluble
Cl-, Br-, and I- are soluble except when paired with Ag+, Pb2+, Cu+, Hg22+
Sulfates (SO42-) are soluble except those of Ca2+, Sr2+, Ba2+, Ag+, and Pb2+

• Insoluble Ionic Compounds:

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