Question

Consider the reaction when aqueous solutions of calcium nitrate and potassium hydroxide are combined.?

Answer 1

The reaction is a double replacement (displacement) reaction, also called a metathesis.

Explanation:

Balanced equation

`"Ca(NO"_3)_2("aq") + "2KOH(aq)"` `rarr` `"Ca(OH)"_2("s")darr + "2KNO"_3("aq")"`

The reaction is a double replacement replacement (displacement), also called a metathesis. In a double replacement reaction, cations and anions in the reactants trade places, forming products that include a solid precipitate, an insoluble gas, or water. In this case, one product, `"Ca(OH)"_2"`, is a precipitate (solid).

The net ionic equation contains only the ions that participated in the reaction (formation of the precipitate).

`"Ca"^(2+)("aq") + "2OH"^(-)("aq")"` `rarr` `"Ca(OH)"_2("s")darr"`

The down arrow indicates that the solid is a precipitate.