The exercise of barter (trading one point for another) has been in existence sincethe start of time. In the past, for example, items prefer chickens were bartered for newspapers. Human A had actually something that human being B wanted, and vice versa. So, when person A and also person B traded items,they each had actually something new. Some barisalcity.orgical reactions are choose that—compounds swap parts, and also the assets are brand-new materials.

You are watching: In which type of reaction can two compounds exchange ions to form two different compounds

A double-replacement reaction is a reaction in i beg your pardon the optimistic and an unfavorable ions of 2 ionic compound exchange locations to type two brand-new compounds. The general kind of a double-replacement (also dubbed double-displacement) reaction is:

\<\ceAB + \ceCD \rightarrow \ceAD + \ceCB\>

In this reaction, $$\ceA$$ and $$\ceC$$ space positively-charged cations, when $$\ceB$$ and also $$\ceD$$ room negatively-charged anions. Double-replacement reactions normally occur in between substances in aqueous solution. In order because that a reaction to occur, among the products is usually a solid precipitate, a gas, or a molecular link such as water.

## Formation the a Precipitate

A precipitate develops in a double-replacement reaction when the cations from among the reactants integrate with the anions indigenous the other reactant to type an insoluble ionic compound. Once aqueous options of potassium iodide and also lead (II) nitrate are mixed, the complying with reaction occurs:

\<2 \ceKI \left( aq \right) + \cePb(NO_3)_2 \left( aq \right) \rightarrow 2 \ceKNO_3 \left( aq \right) + \cePbI_2 \left( s \right)\>

There room very strong attractive forces that occur in between $$\cePb^2+$$ and also $$\ceI^-$$ ions and also the an outcome is a excellent yellow precipitate (see number below). The other product of the reaction, potassium nitrate, remains soluble.

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Both are dual replacement reactions. Every formulas are correct and the equations space balanced.

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