I answered this the other day for you or another student by giving appropriate information. The secret to this question is to know the solubility rules. Here is a simplified set. Memorize them.
http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html
There will be a reaction between salts in which a solid (precipitate) will form. We usually abbreviate that as ppt. So here is an example.
2KCl(aq) + Pb(NO3)2(aq) ==> 2PbCl2(s) + 2KCl(aq)
AgCl is insoluble, too, so
KCl(aq) + AgNO3(aq) ==> AgCl(s) + KNO3(aq)
Note that BaSO4 is insoluble; therefore,
BaCl2(aq) + K2SO4(aq) ==> 2KCl(aq) + BaSO4(s)
Just go through the list systematically to get all of the possibilities.
For the list of chemicals below, write complete, balanced equations for all possible reactions that would lead to an insoluble salt.
KCl, BaCl2, AgNO3, Pb(No3)2, K2SO4, HNO3
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