Net ionic equation

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complete ionic equation: A molecular equation is useful in describing actual reactant and product substances, it does not tell you what is happening at the level of ions.Ca(OH)2 and Na2CO3 both are soluble ionic substances and therefore strong electrolytes;when they dissolve in water, they go into solution as ions.Each foumula unit of Ca(OH)2 forms one Ca2+ ion and two OH- ions in solutions.Similary, Na2CO3 forms two Na+ ion and one CO3 2- ION IN solution.


 


Now let  us look at the product side of the equation.One product is the precipitate CaCO3 (s).This is an ionic compound,but it is in the precipiate form.We will leave the formula as CaCO3 (s) to show that it is a precipitate.On the other hand,NaOH is a soluble ionic substance and therefore a strong electrolyte;it dissolves in aqueous solution to give ions,which we denote by writing Na+(aq) + OH- (aq).The complete equation is:


 


Ca2+ (aq) + 2OH- (aq) + 2Na+ (aq) + CO3 2- (aq) ---------> CaCO3 (s) + 2Na+ (aq)+ 2OH- (aq)


 


Net ionic equations: A spectator ion is an ion in an ionic equation that does not take part in the reaction.You can cancel such ions from both sides to express the essential reaction that occurs.


 


Ca2+ (aq) + CO3 2- (aq) ---------> CaCO3 (s) + 


 


This is the net ionic equation , an ionic equation from which spectator ions have been cancelled.I shows that reaction actually occurs at ionic level is between calcium ions and carbonate ions to form solid calcium carbonate.