How to write a net ionic equation step by step?

The net ionic equation for the overall reaction that occurs when aqueous solutions of sodium hydroxide and oxalic acid (H2C2O4) are combined and the net ionic equation for the precipitation reaction that occurs when aqueous solutions of nickel(II) acetate and sodium carbonate are combined are explained below.

To write net ionic equations : 

  • Write the balanced molecular equation with phases for each compound. 
  • Break up all aqueous salts or compounds into ions to get the total ionic equation (Only break up strong electrolytes). 
  • Cancel the spectator ions to get the net ionic equation. 

H2C2O4 (weak acid) + 2NaOH(aq) → Na2C2O4 (salt) + H2O (l) 

Ni(C2H3O2)2 (aq) + Na2CO3(aq) → NiCO3(s) + 2NaC2H3O2(aq)

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