Use solubility rules to determine which of the following will produce a precipitate? (A) 3KBr(aq) + AlPO4(aq) → K3PO4 + AlBr3
(B) ZnCl2(aq) + MgSO4(aq) → ZnSO4 + MgCl2
(C) Na2CO3(aq) + CaCl2(aq) → CaCO3 + 2NaCl
(D) NH4OH(aq) + KCl(aq) → KOH + NH4Cl
Which of the above will form a solution NOT a chemical reaction?_______________ Explain.
(B) ZnCl2(aq) + MgSO4(aq) → ZnSO4 + MgCl2
(C) Na2CO3(aq) + CaCl2(aq) → CaCO3 + 2NaCl
(D) NH4OH(aq) + KCl(aq) → KOH + NH4Cl
Which of the above will form a solution NOT a chemical reaction?_______________ Explain.
Answers & Comments
A) 3KBr(aq) + AlPO4(aq) → K3PO4 + AlBr3: According to the solubility rules, all nitrates (like K3PO4) are soluble in water, so K3PO4 will not produce a precipitate. AlBr3 is also soluble in water, so this reaction will not produce a precipitate.
(B) ZnCl2(aq) + MgSO4(aq) → ZnSO4 + MgCl2: According to the solubility rules, none of the products in this reaction are insoluble, so this reaction will not produce a precipitate.
(C) Na2CO3(aq) + CaCl2(aq) → CaCO3 + 2NaCl: According to the solubility rules, CaCO3 is insoluble in water, so this reaction will produce a precipitate.
(D) NH4OH(aq) + KCl(aq) → KOH + NH4Cl: According to the solubility rules, both KOH and NH4Cl are soluble in water, so this reaction will not produce a precipitate.
The reaction that will form a mixture/solution and not a chemical reaction is (D) NH4OH(aq) + KCl(aq) → KOH + NH4Cl. This reaction will not produce a precipitate since both products (KOH and NH4Cl) are soluble in water.