1.

How would you distinguish between baking powder and washing soda by heating?

Answer»
  • The chemical formula of baking powder is sodium hydrogencarbonate (NaHCO3).
  • Whereas, that of washing soda is sodium carbonate (Na2CO3.10H2O) Sodium hydrogencarbonate on heating gives CO2 gas which will turn lime water milky whereas no such gas is obtained from sodium carbonate.

\(2NaHCO_3 \overset{Heat}\rightarrow Na_2CO_3+H_2O+CO_2\)

\(Na_2CO_3.10H_2O \overset{Heat}\rightarrow Na_2CO_3+10H_2O\)


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