Question

Use the solubility generalizations on the information page to predict if one or more precipitates will form when aqueous solutions of chromium(III) sulfate (Cr₂(SO₄)₃) and barium acetate (Ba(CH₃COO)₂) are mixed.

Write the formula of any precipitate that could form in one of the blanks. If a box is not needed, leave it empty. If no precipitate is predicted, leave both blanks empty

___________ ... ____________.

Soluble Ionic Compounds
1.	All sodium (Na+), potassium (K+), and ammonium (NH4+) compounds are SOLUBLE.
2.	All nitrate (NO3-) and acetate (CH3COO-) compounds are SOLUBLE.
3.	Most chloride (Cl-) and sulfate (SO42-) compounds are SOLUBLE -- EXCEPT those also containing: lead, silver, or mercury (I) (Pb2+,Ag+, Hg22+) which are NOT soluble. -- BaSO4 is also NOT soluble.
Not Soluble Ionic Compounds
4.	Most carbonate (CO32-), Sulfide (S2-), phosphate (PO43-) and hydroxide (OH-) compounds are NOT SOLUBLE -- EXCEPT those also containing: sodium, potassium, ammonium*, or lithium (Na+, K+, NH4+ or Li+) which are soluble. -- Ba(OH)2 is also soluble.

* NH₄⁺ with OH^- exists as NH₃(aq)

Answer 1

Aqueous solutions of chromium ( III ) sulfate , Cr2(SO4)3 and barium ( II ) acetate , Ba(CH3COO)2 are combined to form chromium ( III ) acetate , Cr(CH3COO)3 and barium ( II ) sulfate , BaSO4  

As BaSO4 is an insoluble compound and acetate of chromium , Cr(CH3COO)3 is a soluble compound . So , a solid precipitate of BaSO4 will form in the reaction .

Therefore , one precipitate will form and formula of that precipitate is   BaSO4    

Balanced Reaction is :

Cr2(SO4)3(aq) + 3Ba(CH3COO)2(aq) ---> 3BaSO4(s) + 2Cr(CH3COO)3(aq)