NCERT Solution for Class Tenth Science Chapter 2
Acids, Bases and Salts
Intext Questions
Page No-17
Questions No-4
What will happen if a solution of sodium hydrocarbonate is heated? Give the equation of the reaction involved.
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When a solution of sodium hydrocarbonate is heated, sodium carbonate and water are formed with the evolution of carbon dioxide gas.
2NaHCO₃ → Na₂CO3 + H2O + CO2
When a solution of sodium hydrocarbonate (sodium hydrogen carbonate) is heated, sodium carbonate water and carbon dioxide gas evolved.
2NaHCO₃ → Na₂CO₃ + H₂O + CO₂
When a solution of sodium bicarbonate (sodium hydrogen carbonate), NaHCO₃, is heated, it undergoes thermal decomposition to produce carbon dioxide, water, and sodium carbonate. The chemical equation for this reaction is as follows:
2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O
In words, two moles of sodium bicarbonate decompose into one mole of sodium carbonate, carbon dioxide, and water. The evolution of carbon dioxide gas during this reaction can often be observed as bubbling in the solution. This reaction is commonly used in cooking and baking to release carbon dioxide gas, which helps dough rise.