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In which of the following types of reaction is there an exchange of ions between the reactants?
Decomposition
Addition reaction
Double displacement reaction
Disproportion reaction
Double displacement reaction
In a double displacement reaction, two ionic compounds in aqueous solution react by exchanging their positive and negative ions, resulting in the formation of two new compounds (often producing a precipitate or water).
In a double displacement reaction, two ionic compounds in aqueous solution react by exchanging their positive and negative ions, resulting in the formation of two new compounds (often producing a precipitate or water).
Think of two dancing couples who swap partners on the dance floor тАФ Person A from Couple 1 dances with Person B from Couple 2, and vice versa.
Double Displacement = Double Swap (AB+CDтЖТAD+CB)
AB+CDтЖТAD+CB тАФ General equation for double displacement reaction
BaCl2тАЛ(aq)+Na2тАЛSO4тАЛ(aq)тЖТBaSO4тАЛ(тЖУ)+2NaCl(aq) тАФ Precipitation reaction example
When aqueous solutions of two ionic compounds are mixed, the cations and anions dissociate and switch partners. For example, in the reaction between sodium sulfate (Na2тАЛSO4тАЛ) and barium chloride (BaCl2тАЛ), the Ba2+ ions combine with SO42тИТтАЛ ions to form a white precipitate of barium sulfate (BaSO4тАЛ), while Na+ and ClтИТ remain in solution as sodium chloride (Na┬аCl).
Involves mutual exchange of metallic and non-metallic ions between two reactants.
Frequently observed as precipitation reactions where an insoluble solid (precipitate) is formed.
Also includes neutralization reactions (acid + base тЖТ salt + water).
Does not involve a change in oxidation states of the reacting elements.
Useful for precipitating specific insoluble salts.
Drives reactions forward due to the removal of ions from solution (precipitation or gas formation).
Reactions are extremely fast and sometimes difficult to control quantitatively without titration.
Wastewater treatment for heavy metal removal via precipitation.
Qualitative salt analysis in analytical chemistry to identify unknown cations and anions.
Decomposition reaction involves a single reactant breaking down into two or more products (ABтЖТA+B).
Addition (combination) reaction involves two or more substances combining to form a single product (A+BтЖТAB).
Displacement reaction involves a more reactive element displacing a less reactive element from its compound (A+BCтЖТAC+B).
C is correct тАФ Double displacement reaction involves an exchange of ions between the reactants to form new compounds.
Always check the solubility rules for precipitates (like sulfates, carbonates, and halides of heavy metals) when identifying double displacement reactions in exam questions.
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