which of thh following reactants would you add to an aqueous solution of ammonium sulfate in order to precipitate quantitatively all the sulfate?

A. CaCl2
b. Al(NO3)3
c. Zn(C2H3)2)2
d. KBr

CaCl2

cacl2

To determine which reactant will precipitate all the sulfate ions from an aqueous solution of ammonium sulfate, we need to know the solubility rules for common ionic compounds.

The solubility rules state that most sulfates are soluble, except for those of calcium, strontium, barium, lead(II), and silver. So, we need to find a reactant that will form a precipitate with sulfate ions.

Let's look at each option:

A. CaCl2 - Calcium chloride: According to the solubility rules, calcium salts are generally insoluble except for those of Group 1A ions and ammonium ions. Therefore, adding calcium chloride to the solution will indeed precipitate calcium sulfate.

B. Al(NO3)3 - Aluminum nitrate: Aluminum salts are generally soluble, so adding aluminum nitrate will not precipitate sulfate ions.

C. Zn(C2H3)2 - Zinc acetate: Zinc salts are typically soluble, and zinc acetate is no exception. Therefore, it will not precipitate sulfate ions.

D. KBr - Potassium bromide: Bromide salts are generally soluble, so adding potassium bromide will not precipitate sulfate ions.

Therefore, the correct answer is A. CaCl2.

Note: When performing actual experiments, it is essential to consult a reliable reference or follow established laboratory protocols to determine the solubilities of specific compounds.

So the question you are asking is this.

What are the solubilities of
CaSO4
Al2(SO4)3
ZnSO4
K2SO4.

Here is a simplified set of rules to help decide.
http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html