Question

Study the setup in the Figure below and then answer the questions that follow.

1. At the end of the experiment, solid B changed from white to blue. Explain.
2. The other product of the burning candle formed a white precipitate with the calcium hydroxide solution. Write an equation for the reaction. 
3. State the role of apparatus C. 

Answer 1

1. Solid B becomes hydrated hence turns from white to blue 
   OR 
   Burning candles produces water which combines with solid B to make it hydrated
2. CO₂(g) + Ca(OH)₂(aq) → CaCO₃(s) + H₂O(l)
3. To suck the gaseous product from the system