Aqueous magnesium chloride reacts with aqueous aluminum carbonate to form precipitated magnesium carbonate and aqueous aluminum chloride

MgCl₂(aq) + Al₂(CO₃)₂(aq) --> MgCO₃(s) + AlCl₃(aq)

Explanation:

Magnesium Chloride - MgCl₂

Aluminium Carbonate - Al₂(CO₃)₃

Magnesium carbonate - MgCO₃

Aluminium Chloride - AlCl₃

The equation of this reaction is given as;

MgCl₂(aq) + Al₂(CO₃)₃(aq) --> MgCO₃(s) + AlCl₃(aq)

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products