Sistem Koloid • Part 1: Perbedaan Larutan, Koloid, dan Suspensi; Jenis-Jenis Koloid

Summary

This video from Jendela Sains explains the differences between colloidal solutions, suspensions, and true solutions. It introduces the concept of dispersed systems, emphasizing how particles are dispersed in a medium. The video covers key distinctions, such as particle size, visibility under a microscope, and the homogeneity of the mixtures. Various types of colloids, including aerosols, emulsions, and foams, are explored through practical examples like milk, soap, and ink. The video concludes with an overview of the types of colloids and how they are categorized based on the phases of dispersion and dispersed substances.

Takeaways

• 😀 Koloid is a type of dispersion system, consisting of a dispersed substance and a dispersing medium.
• 😀 A dispersion system can be categorized into three types: solutions, colloids, and suspensions.
• 😀 The difference between colloidal solution and suspension is that colloids are homogenous, whereas suspensions are heterogeneous and often show sedimentation.
• 😀 The particle size in a solution is less than 1 nanometer, in colloids it ranges from 1 to 1000 nanometers, and in suspensions, it is greater than 100 nanometers.
• 😀 Colloidal systems are stable and do not easily settle, unlike suspensions which are unstable and tend to settle over time.
• 😀 Solutions are clear and cannot be filtered, colloids cannot be filtered using regular filters but can be filtered using ultrafilters, while suspensions can be filtered with regular filters.
• 😀 Examples of colloids include soap bubbles, mayonnaise, jelly, and mist, while examples of suspensions include coffee and water or sand and water mixtures.
• 😀 Colloids can be classified into different types based on their dispersed and dispersing phases, such as gas in liquid (foam), liquid in solid (gel), and more.
• 😀 Aerosols are colloids where a liquid is dispersed in a gas, such as mist or perfume, while smoke is an example of solid dispersed in a gas.
• 😀 Emulsions are colloidal systems where both the dispersed and dispersing phases are liquid, with examples like milk, coconut milk, and fish oil.

Q & A

What is a dispersion system?

A dispersion system is a mixture that contains two components: the dispersed substance (the solute) and the dispersing medium (the solvent). An example is a solution, where sugar is the solute and water is the solvent.

How do colloidal solutions differ from suspensions?

Colloidal solutions appear homogeneous to the naked eye but are heterogeneous under a microscope. Suspensions, on the other hand, have visible particles and can be filtered easily.

What is the size of particles in colloidal solutions compared to suspensions?

In colloidal solutions, the particle size ranges from 1 to 160 nanometers, while in suspensions, the particle size is typically larger than 100 nanometers.

What is the stability of colloidal solutions and suspensions?

Colloidal solutions are generally stable, although some may not be. Suspensions are unstable and tend to separate into distinct layers over time.

Can colloidal solutions be filtered using ordinary filters?

No, colloidal solutions cannot be filtered using regular filters, but they can be filtered using ultra-filters.

What are some examples of colloids with gas as the dispersed phase?

Examples of colloids with gas as the dispersed phase include soap bubbles (gas in liquid) and foam rubber (gas in solid).

What is the difference between 'aerosol liquid' and 'aerosol solid'?

'Aerosol liquid' refers to liquid droplets dispersed in gas, such as mist or perfume, while 'aerosol solid' refers to solid particles dispersed in gas, like smoke or dust.

What defines an emulsion, and can you provide examples?

An emulsion is a colloid with a liquid as both the dispersed phase and the dispersing medium. Examples include milk, coconut milk, and salad dressing.

What is the role of particle size in distinguishing between a solution, colloid, and suspension?

Solutions have particles smaller than 1 nanometer, colloids have particles ranging from 1 to 160 nanometers, and suspensions have particles larger than 100 nanometers.

Why is the study of colloids important in understanding mixtures and materials?

Colloids are essential in various industries, from food to pharmaceuticals, because their unique properties—such as stability, particle size, and dispersion—make them useful in different applications, like emulsions in cosmetics or foams in cleaning products.