Calcium bromide and Sodium carbonate reaction | CaBr2 + Na2CO3

Calcium bromide and sodium carbonate are water soluble inorganic compounds and each aqueous solution is colourless. Aqueous calcium bromide reacts with aqueous sodium carbonate to form calcium carbonate and sodium bromide. In this tutorial, we will learn more about this reaction.

calcium bromide+ sodium carbonate - CaBr2 + Na2CO3

Calcium carbonate is a white precipitate while all other reactants and products are water soluble.

Balanced reaction of calcium bromide and sodium carbonate

CaBr2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaBr(aq)

1 mol of CaBr2 reacts with 1 mol of Na2CO3 and form 1 mol of CaCO3 and 2 mol of NaBr. These values are important in solving chemical calculations.

Reactants of reaction

Calcium bromide (CaBr2)

Calcium bromide is a white solid at room temperature and soluble in water. Aqueous Calcium bromide solution is a colourless solution. Also, it completely dissociates to Ca2+ and Br- ions in water.

CaBr2(aq) → Ca2+(aq) + 2Br-(aq)

Sodium carbonate (Na2CO3)

Sodium carbonate is also a white solid at room temperature and soluble in water to form a colourless solution. Sodium carbonate also completely dissociates to Na+ and CO32- ions in water.

Na2CO3(aq) → 2Na+(aq) + CO32-(aq)

Products of reaction

Calcium carbonate

When two reactants are mixed, there are Ca2+ and CO32- ions in the aqueous solution. If solubility product of CaCO3 is reached, you can see a white precipitate (CaCO3) is formed at the bottom od the solution.

Let's do a simple calculation.

There is an aqueous solution (100 cm3) which contains 0.01 mol CaBr2. In another aqueous solution (100 cm3), there is 0.01 mol of Na2CO3. These two solution are mixed for reacting.

  1. Calculate how much (mol) calcium carbonate is formed?
  2. Calculate formed calcium carbonate mass?


  1. According to the balanced stoichiometric equation and mixed amount of reactants, reactants are completely consumed. Therefore, amount of formed calcium carbonate is formed is equal to the consumed calcium bromide or sodium carbonate. Then, formed calcium carbonate amount is 0.01 mol.
  2. To find out mass of formed calcium carbonate, multiply the amount of calcium carbonate by molar mass of calcium carbonate (100 g mol-1). So, mass of calcium carbonate is 1g.

What are the other chemicals can be used to precipitate calcium carbonate?

Potassium carbonate can be used instead of sodium carbonate to precipitate calcium carbonate.


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