What are the products of a double displacement reaction?

1 Answer
Nov 24, 2015

Answer:

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

Explanation:

A double displacement (double replacement) reaction occurs when two aqueous ionic solutions 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"_4("s")darr"+ MgCl"_2("aq")"#

#"Na"_2"S(aq)" + "2HCl(aq)"##rarr##"H"_2"S(g)"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")#.