What are the products of a double displacement reaction?

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What are the products of a double displacement reaction?

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Answer 1 · 2015-11-24T00:54:57

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 $AX + BY$ $"AX + BY"$ $\to$ $rarr$ $AY + BX$ $"AY + BX"$ , where $A$ $"A"$ and $B$ $"B"$ are cations, and $X$ $"X"$ and $Y$ $"Y"$ are anions.

Examples of double displacement reactions.

${BaCl}_{2} (aq) {+ MgSO}_{4} (aq)$ $"BaCl"_2("aq")" + MgSO"_4("aq")"$ $\to$ $rarr$ ${BaSO}_{4} (s) ⏐ ↓ {+ MgCl}_{2} (aq)$ $"BaSO"_4("s")darr"+ MgCl"_2("aq")"$

${Na}_{2} S(aq) + 2HCl(aq)$ $"Na"_2"S(aq)" + "2HCl(aq)"$ $\to$ $rarr$ $H_{2} S(g) ↑ ⏐ + 2NaCl(aq)$ $"H"_2"S(g)"uarr"+ 2NaCl(aq)"$

$HCl(aq) + NaOH(aq)$ $"HCl(aq)" + "NaOH(aq)"$ $\to$ $rarr$ $NaCl(aq) + H_{2} O(l)$ $"NaCl(aq)" + "H"_2"O(l)"$

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 $(s)$ $("s")$ and $(g)$ $("g")$ .

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What are the products of a double displacement reaction?

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