Following are the demerits of the chemical equation:
- The concentration of reactants and products are unknown.
- The physical states such as solids, liquids, or gaseous are not explained in the chemical equation.
- Parameters that affect the reaction such as temperature, catalyst, pressures, etc are unknown.
- The time duration required for any reaction to complete are not known.
- With the help of a chemical equation, it is difficult to know if the equation is reversible or irreversible.