G day,
I am struggling a little understanding how to write an equation. I am trying to write an equation for a precipitate reaction to make Calcium Carbonate. I know this is the answer: Ca(N03)2 (s) + Na2c03 (s) ----> CaC03 (s) + 2Na+ (aq) + 2N03- (aq)
But how the hell do you come to this answer if you are asked to write an equation to make calcium carbonate. I understand the whole gaining and losing of electrons (Na+, N03- ect) But i am totally stuck on how to come up with this equation.
Any help would be much appreaciated
I am struggling a little understanding how to write an equation. I am trying to write an equation for a precipitate reaction to make Calcium Carbonate. I know this is the answer: Ca(N03)2 (s) + Na2c03 (s) ----> CaC03 (s) + 2Na+ (aq) + 2N03- (aq)
But how the hell do you come to this answer if you are asked to write an equation to make calcium carbonate. I understand the whole gaining and losing of electrons (Na+, N03- ect) But i am totally stuck on how to come up with this equation.
Any help would be much appreaciated
-
This is a double displacement reaction . You swap around the anions and cations:
Ca(NO3)2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaNO3(aq)
This is the equation which shows that CaCO3 is produced as an insoluble precipitate.. This is known as a molecular equation. This type of double displacement reaction and the equation is very common n chemistry.
In reality the reactants ( Na2CO3 and Ca(NO3)2) and the NaNO3 product all occur in the solutions as ions. But in this molecular equation , they are not shown as such. There is another equation called an ionic equation in which all the dissociating compounds are shown in ionic form. And a third net ionic equation in which only the reacting ions are shown.
But you are asked to show an equation for the formation of CaCO3, and the standard molecular equation that I have given you is what is required.
Ca(NO3)2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaNO3(aq)
This is the equation which shows that CaCO3 is produced as an insoluble precipitate.. This is known as a molecular equation. This type of double displacement reaction and the equation is very common n chemistry.
In reality the reactants ( Na2CO3 and Ca(NO3)2) and the NaNO3 product all occur in the solutions as ions. But in this molecular equation , they are not shown as such. There is another equation called an ionic equation in which all the dissociating compounds are shown in ionic form. And a third net ionic equation in which only the reacting ions are shown.
But you are asked to show an equation for the formation of CaCO3, and the standard molecular equation that I have given you is what is required.