Question

I need to identify the cations A through G as K+, Cu2+, Ag+, Ba2+, Fe3+, Mg2+, or Pb2+

The unknown cation is Br-/OH-

From what I believed I've figured out is:

K+ = F

Cu2+ = A or E

Ag+ = B or C

Ba2+ = G

Fe3+ = A or E

Mg2+ = A or E

Pb2+ = D

I believe this may be correct but I am unable to figure out Cu2+, Ag+, Fe3+, and Mg2+. I also need to make sure that they are correct. This lab is very confusing to me so I am trying to figure it out.

	A	B	C	D	E	F	G
Br-	Soluble	Insoluble	Insoluble	Soluble	Soluble	Soluble	Soluble
SO4 2 -	Soluble	Soluble	Soluble	Insoluble	Soluble	Soluble	Insoluble
PO4 3-	Insoluble	Insoluble	Insoluble	Insoluble	Insoluble	Soluble	Insoluble
OH-	Insoluble	Insoluble	Insoluble	Insoluble	Insoluble	Soluble	Soluble
Unknown (Br-/OH)

I need to write a molecular, ionic, and complete ionic equations for each of the reaction that produced a precipitate.

Reaction 1 - 13

For example,

Reaction 1:

Molecular:

Total Ionic:

Net Ionic:

Answer 1

Therefore,

A---> Fe³⁺ B ---> Ag⁺ C---> Cu²⁺ D ---> Pb²⁺ E ---> Mg²⁺ F ---> K⁺ G ---> Ba²⁺

Reaction 1:

Molecular : Fe(OH)3(aq) + H3PO4 (aq) ----> FePO4(s) + 3H2O(l)

Total ionic : Fe(aq) + 3OH-(aq) + 3H+(aq) + PO43-(aq) ----> FePO4(s) + 3H2O(l)

Net ionic : Fe(aq) + 3OH-(aq) + 3H+(aq) + PO43-(aq) ----> FePO4(s) + 3H2O(l)

Reaction 2:

Molecular : FeCl3(aq) + 3NaOH (aq) ----> Fe(OH)3(s) + 3NaCl(aq)

Total ionic : Fe(aq) + 3Cl-(aq) + 3Na+(aq) + OH-(aq) ----> Fe(OH)3(s) + 3Na+(aq) + 3Cl-(aq)

Net ionic : Fe(aq) + 3OH-(aq) ----> Fe(OH)3(s)

Reaction 3:

Molecular : AgOH(aq) + HBr(aq) ----> AgBr(s) + H2O(l)

Total ionic : Ag+(aq) + OH-(aq) + H+(aq) + Br-(aq) ----> AgBr(s) + H2O(l)

Net ionic : Ag+(aq) + OH-(aq) + H+(aq) + Br-(aq) ----> AgBr(s) + H2O(l)

Reaction 4:

Molecular : 3AgOH(aq) + H3PO4(aq) ----> Ag3PO4(s) + 3H2O(l)

Total ionic : 3Ag+(aq) + 3OH-(aq) + 3H+(aq) + PO43-(aq) ----> Ag3PO4(s) + 3H2O(l)

Net ionic : 3Ag+(aq) + 3OH-(aq) + 3H+(aq) + PO43-(aq) ----> Ag3PO4(s) + 3H2O(l)

Reaction 5:

Molecular : AgCl(aq) + NaOH(aq) ----> AgOH(s) + NaCl(aq)

Total ionic : Ag+(aq) + Cl-(aq) + Na+(aq) + OH-(aq) ----> AgOH(s) + Na+(aq) + Cl-(aq)

Net ionic : Ag+(aq) + OH-(aq) ----> AgOH(s)

Reaction 6:

Molecular : Cu(OH)2(aq) + 2HBr(aq) ----> CuBr2(s) + 2H2O(l)

Total ionic : Cu2+(aq) + 2OH-(aq) + 2H+(aq) + 2Br-(aq) ----> CuBr2(s) + 2H2O(l)

Net ionic : Cu2+(aq) + 2OH-(aq) + 2H+(aq) + 2Br-(aq) ----> CuBr2(s) + 2H2O(l)

Reaction 7:

Molecular : 3CuCl2(aq) + 2H3PO4(aq) ----> Cu3(PO4)2(s) + 6HCl(aq)

Total ionic : 3Cu2+(aq) + 6Cl-(aq) + 6H+(aq) + 2PO43-(aq) ----> Cu3(PO4)2(s) + 6H+(aq) + 6Cl-(aq)

Net ionic : 3Cu2+(aq) + 2PO43-(aq)----> Cu3(PO4)2(s)

Reaction 8:

Molecular : CuCl2(aq) + 2NaOH(aq) ----> Cu(OH)2(s) + 2NaCl(aq)

Total ionic : Cu2+(aq) + 2Cl-(aq) + 2Na+(aq) + 2OH-(aq) ----> Cu(OH)2(s) + 2Na+(aq) + 2Cl-(aq)

Net ionic : Cu2+(aq) + 2OH-(aq) ----> Cu(OH)2(s)

Reaction 9:

Molecular : Pb(OH)2(aq) + H2SO4(aq) ----> PbSO4(s) + 2H2O(l)

Total ionic : Pb2+(aq) + 2OH-(aq) + 2H+(aq) + SO4^2-(aq) ----> PbSO4(s) + 2H2O(l)

Net ionic : Pb2+(aq) + 2OH-(aq) + 2H+(aq) + SO4^2-(aq) ----> PbSO4(s) + 2H2O(l)

Reaction 10:

Molecular : 3Pb(OH)2(aq) + 2H3PO4(aq) ----> Pb3(PO4)2(s) + 6H2O(l)

Total ionic : 3Pb2+(aq) + 6OH-(aq) + 6H+(aq) + 2PO4^3-(aq) ----> Pb3(PO4)2(s) + 6H2O(l)

Net ionic : 3Pb2+(aq) + 6OH-(aq) + 6H+(aq) + 2PO4^3-(aq) ----> Pb3(PO4)2(s) + 6H2O(l)

Reaction 11:

Molecular : PbCl2(aq) + 2NaOH(aq) ----> Pb(OH)2(s) + 2NaCl(aq)

Total ionic : Pb2+(aq) + 2Cl-(aq) + 2Na+(aq) + 2OH^-(aq) ----> Pb(OH)2(s) + 2Na+(aq) + 2Cl-(aq)

Net ionic :Pb2+(aq) + 2OH^-(aq) ----> Pb(OH)2(s)