Question

HCL gas is prepared in school laboratory. Dry and wet litmus paper are kept in contact with the gas.
1) Name the reagent used to prepare HCL gas.
2) state the colour changes observed with the dry and wet litmus paper.
3) Show the formation of ions when HCL gas combines with water

Answer 1

1.sulphuric acid and common salt
2.blue to red
3.HCl+H2O gives H3O+ + Cl-