Question

When aqueous solutions of potassium carbonate and cobalt(II) bromide are combined, solid cobalt(II) carbonate and a solution of potassium bromide are formed. The net ionic equation for this reaction is:? are they gas, solid, liquid, or aq?

Answer 1

`"Co"^(2+)("aq") + "CO"_3^(2-)("aq")"` `rarr` `"CoCO"_3("s")`

Explanation:

Balanced molecular equation

`"K"_2"CO"_3("aq") + "CoBr"_2("aq")"` `rarr` `"CoCO"_3("s") + "2KBr(aq)"`

The net ionic equation includes only those ions that participated in the reaction (produced the precipitate).

`"Co"^(2+)("aq") + "CO"_3^(2-)("aq")"` `rarr` `"CoCO"_3("s")`