Chemical Compound - Salammoniac
Sal Ammoniac
Ammonium Chloride : NH4Cl
Ammonium Chloride is a chemical compound which found in abundance in nature. Ammonium chloride is obtained when ammonia gas is passed through hydrochloric acid (HCl).
NH3 + HCl → NH4Cl
Ammonium Chloride Properties
Properties: Its main physical and chemical properties are as follows –
Physical properties :
Ammonium Chloride is a white colored crystal solid.
It is soluble in water. Heat is absorbed when soluble in water. Hence its solution remains cold.
Chemical properties
Heat effect : On heating, it decomposes into ammonia and hydrogen chloride without melting. On cooling, Salammoniac is obtained again.
NH4Cl ⇌ NH3 + HCl
Reaction with slaked lime : On heating ammonia chloride with dry slaked lime [Ca(OH)2], ammonia gas is evolved.
2NH4Cl + Ca(OH)2 → CaCl2 + 2H2O + 2NH3
Reaction with slaked lime : On heating ammonia chloride with dry slaked lime [Ca(OH)2], ammonia gas is evolved.
2NH4Cl + PbO → PbCl2 + H2O + 2NH3
Reaction with NaOH : On heating salmoniac with caustic soda, ammonia gas is evolved.
NH4Cl + NaOH → NaCl + H2O + 2NH3
Ammonium Chloride Uses
- As reagent in laboratory.
- In the manufacture of dry cells, for wiping utensils and in soldering.
- In the manufacture of fertilizers and ammonia etc.
- For dyeing and calico printing.
- as medicine.
Chemical Compound - Quick Lime
Quick Lime – Calcium oxide – CaO
On heating quick lime stone (CaCO3), calcium oxide is obtained.
CaCO3 → CaO + CO2
Calcium Oxide Properties
Physical properties :
Quick lime is a white colored amorphous solid.
It does not melt on heating in oxy hydrogen flame because it burns with intense light, which is called Limelight.
Its melting point is 2570°C.
chemical properties
When left open in air: – When lime is left open in air, it absorbs moisture and carbon dioxide from the air to form calcium hydroxide [Ca(OH)2] and then calcium carbonate(CaCO3).
CaO + H2O → Ca(OH)2
Ca(OH)2 + CO2 → CaCO3 + H2O