Match the procedural step/question to the correct answer for the extraction of sodium bicarbonate (NaHCO₃) on tube 1 (after the mixture is completely dissolved in ether) .
1) Add hydrochloric acid (HCl) to the mixture and observe the reaction.
2) Add water to the mixture and observe the formation of a White precipitate.
3) Add sodium bicarbonate (NaHCO₃) solution to the mixture and observe the formation of bubbles.
4) Add ethanol to the mixture and observe the separation of layers.