Question

Dilute hydrochloric acid was added to a compound Z of sodium. The solid reacted with the acid to form a colorless solution H and a colourless gas K which formed a white precipitate when bubbled through lime water.
Write the formula of:

1.  
   1. Compound Z 
   2. Colorless gas K 
2. Write an equation for the reaction that took place.

Answer 1

1.  
   1. Na₂CO₃
   2. CO₂ 
2. Na₂CO_3(s) + 2HCl_(aq) → CaCl_2(aq) + H₂O_(l) +CO_2(g)