Question

What happens when a glass rod moistened with concentrated HCl is placed in the gas which contain ammonium chloride and sodium hydroxide?

Answer 1

• When NaOH is added to ammonium chloride, ammonia gas is evolved.
• ${\mathrm{NH}}_4\mathrm{Cl}+\mathrm{NaOH}\to {\mathrm{NH}}_3+{\mathrm{H}}_2\mathrm{O}$
• This gas can be detected when a glass rod dipped in conc. HCl is brought near to it.
• A dense white fumes of ammonium chloride are formed.
• ${\mathrm{NH}}_3+\mathrm{HCl}\to \underset{\mathrm{white}\mathrm{fumes}}{{\mathrm{NH}}_4\mathrm{Cl}}$