# Chemistry

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Write the molecular equation and the net ionic equation for each of the following aqueous reactions.

Ca(NO3)2 + K2CO3

FeSO4 + NaCl

NiCl2 + NaBr

• Chemistry -

Ca(NO3)2 + K2CO3
I assume Ca(NO3)2 is (aq) and K2CO3 is (aq); technically the dry materials won't react.

Write the molecular equation.
Ca(NO3)2 + K2CO3 ==> CaCO3(s) + 2KNO3

The reaction takes place because CaCO3 is insoluble. To change to an ionic equation, convert everything into ions EXCEPT
a. gases
b. insoluble materials.
c. weak electrolytes.

Ca^+2 + 2NO3^- + 2K^+ + CO3^-2 ==> CaCO3 + 2K^+ + 2NO3^-

Now cancel common ions that appear on both sides; i.e., 2NO3^- and 2K^+ and the NET ionic equation is
Ca^+2(aq) + CO3^-2(aq) ==> CaCO3(s)

The others are done the same way IF they react.

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