cotton wool soaked in ammonia
solution gives off ammonia gas
cloud of chemical particles
cotton wool moked in hydrochlorio
seld gives off hydrogen chloride gas
In one end she puts a piece of cotton wool
soaked in ammonia solution, in the other end, she
puts a piece of cotton wool soaked in
concentrated hydrochloric acid. The cotton wool
soaked in ammonia solution gives off ammonia
gas. The cotton wool soaked in the concentrated
hydrochloric acid gives off hydrogen chloride gas.
(i) Why do the particles of ammonia gas and
hydrogen chloride gas move along the glass
tube? (ii) What is this process called? What are the
particles of ammonia and hydrogen chloride
called?
Answers
Answer:
1) In this classic demonstration, from the Royal Society of Chemistry, cotton wool soaked in ammonia and hydrochloric acid are placed at either end of a sealed tube. The two gasses diffuse through the tube and when they meet a reaction takes place forming a white solid of ammonium chloride.
2) Diffusion
Diffusion rates of ammonia and hydrogen chloride gases: 10.1.2 ... one part of household ammonia. ... Hold a piece of cotton wool soaked in ammonia solution, NH3 (aq)
3) Elements, Compounds and Mixtures
hydrogen chloride molecules (HCl). HCl and NH3 molecules diffuse through the air towards each other. called ammonium chloride, NH4Cl. hydrogen chloride + ammonia ammonium chloride.
1. Ans: The ammonia gas, having a lower molecular weight than the hydrogen chloride, will diffuse faster and travel a greater length of the tube. Consequently, the white ring of ammonium chloride will form much closer to the hydrochloric acid end of the tube.
Therefore, the particles of ammonia gas and hydrogen chloride gas moves along the glass tube.
2. Ans: This process is called Diffusion.
Diffusion is the net movement of molecules from an area where they are at a higher concentration to areas where they are at a lower concentration.
3. Ans: A particle of ammonia is called an atom. Hydrogen chloride (HCl), a compound of the elements hydrogen and chlorine, is a gas at room temperature and pressure.
A solution of the gas in water is called hydrochloric acid. Hydrogen chloride is a colourless gas of strong odour. It condenses at −85 °C (−121 °F) and freezes at −114 °C (−173 °F).