A rough & ready method involves memorising three numbers â 3, 5 and 8 â and the fact that 1 km in miles is approximately equal to the first of these numbers divided by the second, or alternatively the second divided by the third. That is: 1 km â 3/5 or 5/8 miles.
Ammonium chloride solutions with ammonia are used as buffer solutions. In paleontology, ammonium chloride vapor is deposited on fossils, where the substance forms a brilliant white, easily removed and fairly harmless and inert layer of tiny crystals.
Description. In this demonstration you can observe an endothermic reaction. Solid hydrated barium hydroxide is mixed with solid ammonium chloride in a beaker. The liquid produced evolves ammonia gas and the temperature drops dramatically to about -20 Â°C. In this demonstration you can observe an endothermic reaction.