Question

how can we prepare sodium carbonate [washing soda] from sodium hydrogen carbonate

Answer 1

Answer:

Washing soda is prepared by sodium carbonate by adding 10 molecules of water of crystallization to each formula unit and is also known as sodium carbonate decahydrate or washing soda.

SodiumCarbonateNa2CO3+10H2O⟶washing sodaNa2CO3.10H2O

Washing soda is a sodium salt that is basic nature.

Washing soda can be used to remove both temporary and permanent hardness in water. It is soluble in water and adds a large amount of carbonate ions in the water. These react with dissolved calcium and magnesium ions to produce insoluble precipitates. 

Sodium carbonate is soluble but calcium carbonate and magnesium carbonate are insoluble.

hope it helps you.

Answer 2

Answer:

Na2Co3.10H2O can be prepared by adding 10 moles of H2O to Na2Co3

Explanation:

Equation

Na2CO3 +10H20 --------------> Na2CO3. 10 H2O