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Besides its use in making black-and-white film, silver nitrate (AgNO₃) is used similarly in forensic science. The NaCl left behind in the sweat of a fingerprint is treated with AgNO₃ solution to form AgCl. This precipitate is developed to show the blackand- white fingerprint pattern. Given that ΔH lattice = 822 kJ/mol and ΔH hydr = - 799 kJ/mol for AgNO₃, calculate its ΔH soln.

Answer :

The precipitate is developed to show the blackand- white fingerprint pattern, ΔH soln is 23kJ/mol

Given,

ΔH lattice = 822 kJ/mol

ΔH hydr = - 799 kJ/mol for AgNO₃

ΔH soln = ΔH lattice + ΔH hydr = 822-799 = 23kJ/mol

Precipitate

Precipitation in an aqueous solution is the process of changing a dissolved component from a super-saturated solution into an insoluble solid. Precipitate refers to the solid that forms. The chemical agent responsible for the formation of the solid during an inorganic chemical reaction is known as the precipitant.

Supernate or supernatant are other names for the clear liquid that remains above the precipitated or centrifuged solid phase. When solid impurities separate from a solid phase, the concept of precipitation can be applied to various areas of chemistry as well as the solid phases themselves. When a compound's concentration is higher than its solubility, precipitation could happen. Changes in temperature, solvent evaporation, or solvent mixing may be to blame for this.

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