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

Explanation

The chemical formula of baking powder is sodium hydrogencarbonate `(NaHCO_3)` , whereas , that of washing soda is sodium carbonate `(Na_(2)CO_(3).10H_(2)O)`.
Sodium hydrogencarbonate on heating gives `CO_2` gas which will turn lime water milky whereas no such gas is obtained from sodium carbonate.
`2NaHCO_(3)overset("Heat")rarrNa_(2)CO_(3)+H_(2)O+CO_(2)`
`Na_(2)CO_(3).10H_(2)Ooverset("Heat")rarrNa_(2)CO_(3)+10H_(2)O`