Chlorine gas can be prepared in laboratory with hydrochloric acid and manganese-dioxide.
Method
Put manganese lump in a round flask , now put concentrated hydrochloric acid into the round flask with thistle funnel and fit the flask with cork having a hole ,Now attach a tube into the hole of cork and leave to tube into an empty container,so the gas can be collected.The container must be sealed with cork having only one hole for the attachment of tube (from flask to container).Set the apparatus and there should be no leakage.Now heat the manganese lump and hydrochloric acid with a bunsen burner , the greenish gas is collected in the container which is called chlorine gas.
Reaction
MnO2(s) + 4HCl ---> MNCl2 (aq) + Cl2(g) + 2H2O(2)
safety instructions
1-The flask and container should be sealed accurately so the gas could not escape outside in atmosphere and should not be inhaled because it is very poisonous gas and contains toxic
2-Hydrochloric acid should be handled with care and you should work with an expert so there could be no risks of incidents.
3-All the apparatus needed should be washed before use and must be in suitable condition , damaged or broken apparatus can't be use.
4-The chemicals needed should not be expired.
Method
Put manganese lump in a round flask , now put concentrated hydrochloric acid into the round flask with thistle funnel and fit the flask with cork having a hole ,Now attach a tube into the hole of cork and leave to tube into an empty container,so the gas can be collected.The container must be sealed with cork having only one hole for the attachment of tube (from flask to container).Set the apparatus and there should be no leakage.Now heat the manganese lump and hydrochloric acid with a bunsen burner , the greenish gas is collected in the container which is called chlorine gas.
Reaction
MnO2(s) + 4HCl ---> MNCl2 (aq) + Cl2(g) + 2H2O(2)
safety instructions
1-The flask and container should be sealed accurately so the gas could not escape outside in atmosphere and should not be inhaled because it is very poisonous gas and contains toxic
2-Hydrochloric acid should be handled with care and you should work with an expert so there could be no risks of incidents.
3-All the apparatus needed should be washed before use and must be in suitable condition , damaged or broken apparatus can't be use.
4-The chemicals needed should not be expired.