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QUESTION

# How do you recognize a double displacement reaction?

One of the products must be a solid precipitate, an insoluble gas, or water.

A double displacement (double replacement) reaction occurs when two aqueous ionic react to produce a solid precipitate, an insoluble gas, or water. If none of these are produced, then a double displacement did not take place.

The general equation for a double displacement reaction is "AX + BY"rarr"AY + BX", where "A" and "B" are cations, and "X" and "Y" are anions.

Examples of double displacement reactions.

"BaCl"_2("aq")" + MgSO"_4("aq")"rarr"BaSO"_4darr"+ MgCl"_2("aq")"

"Na"_2"S(aq)" + "2HCl(aq)"rarr"H"_2"S"uarr"+ 2NaCl(aq)"

"HCl(aq)" + "NaOH(aq)"rarr"NaCl(aq)" + "H"_2"O(l)"

The down arrow darr indicates the formation of a solid precipitate, and the up arrow uarr indicates the formation of a gas. You can also use the symbols ("s") and ("g").