Predicting whther double displacement reactions will take place...?

Using three criteria for double displacement reactions, together with a solubility table, predict whether a double displacement reaction will occur in each example.





a. K2S + CuSO4


b. NH4OH + H2C2O4


c. KOH + NH4Cl


d. NaC2H3O2 + HCl


e. Na2CrO4 + Pb(C2H3O2)2


f. (NH4)2SOH4 + NaCl


g. BiCl3 + NaOH


h. KC2H3O2 + CoSO4


i. Na2CO3 + HNO3


j. ZnBr2 + K3PO4

Predicting whther double displacement reactions will take place...?
the 3 criteria I assume you are referring to are


1) formation of a precipitate (insoluble solid)


2) formation of a gas - like CO2 or H2S


3) formation of a molecule like H2O or a weak acid like HF





IF none of the 3 above happen, then the reaction does NOT take place





a. K2S + CuSO4 --%26gt; CuS + K2SO4 (CuS is insoluble)


b. 2 NH4OH + H2C2O4 --%26gt; 2 H2O + (NH4)2C2O4


c. KOH + NH4Cl --%26gt; no reaction


d. NaC2H3O2 + HCl --%26gt; HC2H3O2 + NaCl (HC2H3O2 is a molecule)


e. Na2CrO4 + Pb(C2H3O2)2 --%26gt; PbCrO4 + 2 NaC2H3O2 (PbCrO4 is insoluble)


f. (NH4)2SOH4 + NaCl --%26gt; no reaction


g. BiCl3 + 3 NaOH --%26gt; Bi(OH)3 + 3 NaCl (Bi(OH)3 is insoluble)


h. KC2H3O2 + CoSO4 --%26gt; no reaction


i. Na2CO3 + 2 HNO3 --%26gt; H2O + CO2 + 2 NaNO3


j. 3 ZnBr2 + 2 K3PO4 --%26gt; Zn3(PO4)2 + 6 KBr (Zn3(PO4)2 is insoluble)
Reply:Double Replacement reactions depend on the production of a solid (precipitate), liquid, gas, or redox. All of these will remove ions from the solution.





The first and last ions go together as a product and the middle two ions go together as the other product. Look up both products on a table of solubility. If they are insoluble, the reaction will occur. If a liquid or gas is formed the reaction will occur. If the charges of the ions change during the reaction (redox) a reaction will occur. If none of these thing happen no reaction will occur.