Respuesta :
A solid solute can be recovered from a solution by evaporating the solvent completely.
This can be done by heating the solution appropriately. Heating a solution with organic solutes such as sugar will most likely destroy the solute so it's best to let the solution stand in an open area and let it evaporate by itself. However, if you have an inorganic solute such as salt (NaCl), you can completely boil out the water without any problem.
Also, in a research laboratory, a rotary evaporator is commonly used. This instrument employs the principle of vacuum distillation and is used in mainly in removing solvents in solutions.
This can be done by heating the solution appropriately. Heating a solution with organic solutes such as sugar will most likely destroy the solute so it's best to let the solution stand in an open area and let it evaporate by itself. However, if you have an inorganic solute such as salt (NaCl), you can completely boil out the water without any problem.
Also, in a research laboratory, a rotary evaporator is commonly used. This instrument employs the principle of vacuum distillation and is used in mainly in removing solvents in solutions.
Two common laboratory procedures that can be used to recover the solid solute from the aqueous solution are crystallization and evaporation.
An aqueous solution contains a solute dissolved in water. If the solute is a solid, it can be recovered by the following laboratory procedures;
- Crystallization
- Evaporation
To carry out crystallization, the vessel could be seeded with some crystals to aid formation of more crystals. The solution could also be cooled to enable crystallization. Sometimes, the vessel may be scratched to enable the crystals to form.
Evaporation is done using an open dish placed on a Bunsen burner. The dish containing the solution is placed on the burner and heated until the solvent completely escapes and the solid solute is recovered.
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