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The reaction given below is an example of which of the following types of reaction? Potassium bromide(aq) + Barium iodide(aq) тЖТ Potassium iodide(aq) + Barium bromide(s)
Displacement reaction
Combination reaction
Double displacement reaction
Decomposition reaction
Double displacement reaction
This is a double displacement reaction, where the ions of two aqueous ionic compounds exchange places to form two new compounds. One of the products often forms a precipitate, which is a solid that separates from the solution, as indicated by the (s) symbol.
This is a double displacement reaction, where the ions of two aqueous ionic compounds exchange places to form two new compounds. One of the products often forms a precipitate, which is a solid that separates from the solution, as indicated by the (s) symbol.
Think of it like a dance where two pairs of partners switch partners; the original pairs break up and rearrange to form two new pairs, with one pair potentially leaving the dance floor (the precipitate).
Switching Partners: 'The Ions swap, the partners swap, a new product hits the top!'
AB+CDтЖТAD+CB тАФ The general skeleton equation for double displacement
In a double displacement reaction, the general chemical equation is represented as AB(aq)+CD(aq)тЖТAD(aq)+CB(s). In the given reaction, the potassium ion (K+) and barium ion (Ba2+) swap their respective anions, bromide (BrтИТ) and iodide (IтИТ), to produce new substances. The formation of a solid BaBr2тАЛ(s) confirms the occurrence of the reaction.
Also known as a metathesis reaction.
Usually occurs in aqueous solutions.
Often results in the formation of a precipitate, a gas, or water.
The reaction involves an exchange of ions between the two reactants.
Useful for preparing specific insoluble salts through precipitation.
Not all combinations lead to useful products.
Precipitation of silver chloride in analytical chemistry.
Waste water treatment using heavy metal removal.
Precipitation reactions are a common subtype of double displacement reactions.
Option A (Displacement) is for single element replacement (e.g., A+BCтЖТAC+B).
Option B (Combination) is for synthesis (e.g., A+BтЖТAB).
Option D (Decomposition) is the breaking down of one substance (e.g., ABтЖТA+B).
C is correct тАФ The reaction involves an exchange of ions between two compounds to form new products, which is the definition of a double displacement reaction.
Remember: Single displacement involves replacing one element, while double displacement involves swapping ions between two compounds. Look for (aq) and (s) state symbols to identify precipitation.
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