Question

an unknown salt when heated with buses flame produced a bright-yellow flame.an aqueous solution of this salt when reacted with dilute HCl related a gas turns lime water milky. upon addition of calcium chloride solution to an aqueous solution of salt ,a white precipitate is formed. what is the unknown salt?

Answer 1

Sodium gives a bright-yellow flame.

The gas that turns lime water milky is CO₂.

White precipitate formed upon addition of calcium chloride is CaCO₃.

Unknown salt = Na₂CO₃.