Unsaturated Solutions - Definition, Formation, Properties, Examples, FAQs

What is saturated and unsaturated solution?

Saturated solutions are those solutions which contain the maximum amount of solute that can dissolve in a solvent and after that solvent has no tendency to dissolve more or we can say that solution present at the saturated point is called saturated solution. Example of saturated solution is carbonated water.

Unsaturated solution definition

Unsaturated solution is the solution which has a tendency of solute to get mixed in the solution up to its saturated point is called unsaturated solution. The main example of unsaturated solution is sand in water.

Types of saturation:

There are basically three types of saturation in any solution which can be discussed as follows:

1. Solute present in an unsaturated solution is very less as compared to its saturation point and in this case there is no undissolved particle present in the solution.

2. In this case a saturated solution has more solvent as compared to its saturation point and this solute will have no tendency to dissolve properly therefore we can see the undissolved particle in the solvent. Usually these particles are dense in nature so it remains undissolved at the bottom of the container.

3. A supersaturated solution has more solvent dissolved than a saturated solution. Crystallization or precipitation will easily separate the solvent from the solution. To supersaturate the solution, certain conditions may be required. It aids in increasing the solubility of a solution so that additional solute may be added.

Formation of unsaturated solution:

To make the solution unsaturated we first have to add solute in a solvent. At the first stage, the solute starts dissolving in a solvent and it makes the solution uniform in nature. This type of solution in which the solute gets dissolved is called an unsaturated solution.

Unsaturated solutions have a tendency to dissolve more and more solute in its solvent until it reaches its saturation point. After attaining a saturated point a solute is no more able to dissolve in any solvent and that solution is a saturated solution. Hence from this discussion, we can conclude that every solution is said to be an unsaturated solution until it reaches its saturation point.

Properties of unsaturated solution:

1. Unsaturated solutions are generally said to be highly reactive in nature as compared to saturated solutions. This can be explained by an example i.e. when a significant amount of unsaturated fatty acids, such as linseed oil or triglyceride olive oil, is swiftly deposited, it is faster than when a large amount of saturated fatty acids, such as coconut fat, is rapidly deposited.

2. A fatty acid having a double or triple bond in a lengthy carbon chain might generate a curve in the carbon chain.

3. By locking the atoms into precise structural forms, some hydrocarbons prevent the atoms from rotating around the bond.

Examples of saturated and unsaturated solutions

1. Adding sugar in a hot cup of coffee further produces an unsaturated sugar solution.

2. Vinegar is also said to be an unsaturated solution in which acetic acid is dissolved in water.

3. Mist is also said to be an unsaturated water vapor solution present in the air.

4. Gaseous solutions have gas as the solvent, while the solute might be solid, liquid, or even gaseous. Air, smoke, and mist are all examples of unsaturated gaseous solutions.

5. A 0.01 M HCl solution in water is an unsaturated hydrochloric acid solution.

Other than this there are also many examples of unsaturated solutions as every solution is said to be unsaturated in nature until it reaches its saturation point.

In an unsaturated solution, the solute concentration is substantially lower than its solubility equilibrium. Each solution will have a limit for a given solvent. As a result, solutes have a defined value for solubility in the solvent.

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Factors which affects saturation:

1. Temperature: With the increase in temperature solubility of solution also increases which increases the formation of anion.

2. To increase solubility, the solids must be finely separated.

3. In a still solution, concentration accumulates at the solvent surface, creating increased crystallisation, but stirring the solution minimizes this by increasing the net dissolving rate.

4. In contrast to the rate of solubility, the rate of crystallisation is determined by the concentration of the solute at the crystal surface, which is mostly determined by temperature.

5. The solution would be saturated, and dynamic equilibrium could be attained if the solubility and crystallisation rates were the same.

In an unsaturated solution the concentration of solute present is lower as compared to its equilibrium solubility or we can say to its saturation point. This corresponds to the fact that each solute will have a certain limit to dissolve in its particular solvent.

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NCERT Chemistry Notes:

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