aqueous potassium chloride will react with which of the following?

Question

aqueous potassium chloride will react with which of the following?

A. calcium nitrate

B. sodium bromide

C.lead nitrate

D.barium nitrate

E. sodium chloride

 

I know the answer is lead nitrate but I do not know why

Answer 1

The only reaction would be with lead nitrate.  The reason is because a precipitate forms.  If you look at the net ionic equation, you will see how this occurs.

2KCl(aq) + Pb(NO₃)₂(aq) ==> 2KNO3(aq) + PbCl₂(s)  complete molecular equation

2K⁺(aq) + 2Cl^-(aq) + Pb²⁺(aq) + 2NO₃^-(aq0 ==> 2K⁺(aq) + 2NO₃^-(aq) + PbCl₂(s) ionic equation

Pb²⁺(aq) + 2Cl^-(aq) ==> PbCl₂(s)  NET IONIC EQUATION

 

If you do the same for all the others, you will see that all the ions are spectator ions, and thus, NO REACTION.

Answer 2

KCl will "react" with Ca(NO3)2, but no precipitate will form because CaCl2 and KNO3 are both soluble

 

KCl  will react with NaBr because K is "stronger" than Na, but KBr and NaCl are both soluble, so no precipitate will form.

 

KCl will react with Pb(NO3)2 to form PbCl2 and KNO3, but although KNO3 is soluble, PbCl2 is not.  A precipitate will form.

 

KCl will react with Ba(NO3)2 to form BaCl2 and KNO3, but both are soluble so no precipitate will form.

 

KCl will react withNaCl, but, since the ani0n is shared, the same salts form.  Both are soluble.

 

In summary, your question is/should be about solubility, not whether a chemical reaction takes place.