Definition of Homogeneous Mixture
Homogeneous Mixture – These are the types of mixtures in which the components mixed are uniformly distributed throughout the mixture. In other words, “they are uniform throughout”. All solutions would be considered homogeneous.
The word homogeneous comes from Latin and Greek. The prefix homo means ‘same’ and gene means ‘kind’. The suffix -ous makes it an adjective.
So when you describe a mixture as homogenous, you are saying it is ‘of the same kind’ throughout the whole mixture.
We can observe only one phase of matter in a homogeneous mixture. Key points regarding such mixtures are :
- Particles are distributed uniformly.
- We can’t judge a homogeneous mixture by just seeing it.
- Homogeneous mixtures are also called solutions.
- Uniform composition.
- Example: rainwater, vinegar, etc.
Characteristics of Homogeneous Mixture
- Homogeneous mixtures appear uniform to the eye. They consist of a single phase, be it liquid, gas, or solid, no matter where you sample them or how closely you examine them. The chemical composition is the same for any sample of the mixture.
- A homogeneous mixture is one that’s mixed or blended together so well that all of the ingredients will not separate out, even over time. Something that’s homogeneous can only be separated by a mechanical process or action, such as heat or using fine filters.
- As we will see, homogeneous mixtures can be solids, gasses, or liquids.
One example of a solid homogeneous mixture is steel. All of the different elements that make up steel are spread evenly throughout it. It’s not its own chemical substance, though; it’s just a mixture.
Copper and zinc can be put together to make another homogeneous mixture: brass.
Gasses can be homogeneous mixtures, too. The air that we breathe around us is a homogeneous mixture. It’s made up of nitrogen, oxygen, carbon dioxide, and many other gasses. But you can’t tell the difference when you’re breathing, since it is all mixed up and spread out evenly.
A liquid that is homogenous is called a solution. A solution is a mixture made of two or more things (at least one liquid) that are mixed up together evenly.
A simple example of a solution would be salt water. When salt is dissolved in water, the salt spreads out within the water evenly. If you taste it, you’ll be drinking water that’s salty, and you won’t feel any salt crystals on your tongue. In order to separate the salt from the water, you’d have to heat the water and boil it out, leaving the salt behind.
This is an example of a mechanical action like we talked about earlier. Any chemical solution or alloy is a homogeneous mixture.
Examples of solutions include sugar water and powdered drink mix in water, while alloys include sterling silver and bronze. Emulsions are homogeneous mixtures, although they often become heterogeneous when examined microscopically.
Examples of emulsions are homogenized milk, mayonnaise, and egg yolk.
Properties of Homogeneous Mixture
Homogeneous mixture display certain properties
- A homogenous mixture consists of a single phase. It consists only of a solid, liquid, or gas. While the components of the mixture retain their chemical identity, they aren’t visibly separate. But, at the molecular level, the mixture contains multiple compounds or elements.
- Samples taken from different parts of the mixture have identical composition and characteristics.
- It’s usually not possible to separate components of a homogeneous mixture using a mechanical method like filtration.
- All solutions are the instances of a homogenous mixture.
- The size of the particles in such a case is less than one nanometer.
- You can’t separate the boundaries of particles.
- You can’t separate the constituent particles here utilizing centrifugation or decantation.
- Alloys are the instances of a solution.
- The particles of a homogeneous mixture are less the one nanometer.
- A homogenous mixture does not show Tyndall effect.
- The boundaries of particles cannot be differentiated.
- The constituent particles of homogenous mixture cannot be separated using centrifugation or decantation.
- Alloys are the examples of solution.
Seperation of Homogeneous Mixture
Followings are the methods for separation of homogeneous mixture :
Evaporation is a technique used to separate out homogeneous mixtures that contain one or more dissolved salts. The method drives off the liquid components from the solid components. The process typically involves heating the mixture until no more liquid remains.
One of the simplest methods used to separate mixtures is filtration. If one of the components is a liquid and the other is a solid, filtration is as easy as pouring the whole mixture through filter paper.
An everyday example of filtration can be seen in a coffee maker, where the coffee passes through a paper filter but the grounds do not.
When one compound is dissolved in another, or when two liquids are mixed together, the most commonly used method to separate them is distillation.
In distillation, the mixture is slowly heated over a Bunsen burner or hotplate. Because the components in a mixture have different boiling points, one of them will boil before the other. The vapor from this compound can be collected from a condenser, enabling it to be isolated in a pure form.
At some time all of us have marked our shirt with a pen. Sometimes we get lucky and the ink doesn’t stick well to the fabric. In these cases, we can clean the shirt by putting it in the wash.
Sometimes we get very unlucky and the ink sticks to the fabric so well that it’s there for good, no matter how many times it’s washed with bleach and detergent.
In the same way chemical substances can frequently be separated from one another based on how well they stick to a solid. The use of this difference in “stickiness” to separate the components of a mixture is referred to as chromatography.
Typically, chromatography is performed by placing a mixture of two or more chemicals into a glass column filled with silica.
When an organic solvent such as ethyl acetate or alcohol is poured through the column, one of the components of the mixture will tend to stick to the silica better than the other.
As a result, the less sticky one will pass through the column more quickly, while the stickier one will take a little longer.
Let’s say that you have a compound dissolved in a liquid that you want to remove. For example, you have a small amount of salt dissolved in oil and want to remove it. How would you do this? Though distillation could do the job, it takes a long time and considerable effort.
An alternate way of making this separation is to find a liquid that isn’t soluble with the first liquid and that’s better at dissolving the salt than the oil is.
When the two liquids are mixed and shaken, the salt will tend to move from the oil (where it’s not very soluble) into the water (where it is). When this process is complete, it’s a simple matter to pour out the water leaving behind the pure oil.
Homogenization is a process that turns a heterogeneous mixture into a homogeneous mixture. The term is applied to liquid mixtures. Homogenized milk is a good example.
Ordinarily, milk separates into layers over time. Homogenization breaks up the fat globules in milk (the cream) to evenly disperse them, forming an emulsion. Homogenized milk maintains its uniform composition, so it is a homogeneous mixture.
The homogenization process involves reducing the size of the fat globules (the cream that rises to the top of the glass or bottle) into minuscule portions that are dispersed evenly throughout the milk.
Homogenization usually is achieved by pumping milk through small openings under very high pressure. The purpose of homogenization is to reduce the size of the particles making up a sample. In simple terms, it’s a bit like taking a boulder and smashing it into gravel, except, in this case, the gravel pieces would be all the same size and shape.
So this is all about homogeneous mixture. I hope you like the article.