the hydrochloric acid bottles left out in the laboratory, with time, become covered with white powder.?

Question

2. the hydrochloric acid bottles left out in the laboratory, with time, become covered with white powder. Suggest a possible composition for this powder. Why do the ammonia bottles become less covered than do the HCl bottles?

Answer 1

The white solid will be ammonium chloride, NH4Cl, and there is more on the HCl bottles than the ammonia bottles because NH3 is a lighter gas, and travels faster to the HCl than the HCl travels to the NH3.