Study S1 Science Science - Solutions and Suspensions - Geniebook

Solutions And Suspensions

In this article, the following are the objectives that will be discussed.

  • Understand that solutions and suspensions are mixtures. 
  • Distinguish between solute, solvent and solution.
  • State the factors affecting solubility.
  • State the factors affecting the rate of dissolving.

 

Types Of Mixtures

The two types of mixtures are solutions and suspensions.          

An example of a solution is vinegar and an example of a suspension is oil salad dressing.                                                            

 

Solutions

 

Credits: Kevin Kelly

 

What are solutions?

A solution is a homogeneous mixture, where the particles are evenly distributed. Hence, a solution has a uniform appearance and composition throughout.

A solution is made up of a solute and a solvent.

A solute is a substance that dissolves in a solvent (e.g. salt).

A solvent is a substance that dissolves the solute (e.g. water).

 

Properties of Solutions

  1. The solutes in solutions are very small particles.
  2. Solutions are clear and transparent.
  3. The solute particles in a solution do not settle down to the bottom of the beaker when left undisturbed.
  4. No residue is left after filtering a solution.

 

Suspensions

 

Credits: Mateusz Feliksik

 

What are suspensions?

A suspension is a mixture in which insoluble substances are suspended in a liquid or gas. It is a heterogeneous mixture, where the particles are not evenly distributed. Hence, a suspension does not have a uniform appearance and composition.

 

Properties Of Suspensions

  1. The solutes of suspensions are large and insoluble particles.
  2. Suspensions are opaque.
  3. The solute particles in a suspension settle down after some time when left undisturbed.
  4. Residue is left on the filter paper after filtering a suspension.

 

Solubility

Solubility is the ability of a solute to dissolve in a solvent.

 

Factors Affecting Solubility:

  • Nature of solvent
  • Nature of solute
  • Temperature

 

Rate Of Dissolving

The rate of dissolving is the amount of solute that dissolves in a fixed amount of solvent, given a fixed amount of time.

 

Factors Affecting the Rate of Dissolving:

  • Size of solute particles
  • Rate of stirring
  • Temperature

 

Revision Questions

Here are some questions for us to look into, based on the objectives of this article.

 

Question 1:

Which of the following explains how suspensions are formed?

 

  1. Compounds that are chemically combined
  2. Elements that are chemically combined
  3. Substances that dissolve in a liquid
  4. Substances that do not dissolve in a liquid 

 

Solution:

(D) Substances that do not dissolve in a liquid 

Explanation:

A suspension is a mixture in which insoluble substances are suspended in a liquid or gas.

 

Question 2:

Which of the following explains the rate of dissolving of a solute?

 

  1. How much a solute dissolves in a fixed volume of solvent
  2. How much a solute dissolves in any volume of solvent
  3. How fast a solute dissolves in a fixed volume of solvent
  4. How fast a solute dissolves in any volume of solvent

 

Solution: 

(C) How fast a solute dissolves in a fixed volume of solvent

Explanation:

Rate of dissolving is the amount of solute that dissolves in a fixed amount of solvent, given a fixed amount of time. 

 

Question 3:

Which of the following word equations is correct?

 

  1. solute + solute → solution
  2. solution + solvent → solute
  3. solute + solution → solvent
  4. solvent + solute → solution

 

Solution:

(D) solvent + solute → solution

Explanation:

A solution is where the solute dissolves in a solvent.

 

Question 4:

Which of the following affect the solubility of a solute?

 

  1. Nature of solute
  2. Rate of stirring
  3. Temperature of solvent

 

  1. I and II only
  2. I and III only
  3. II and III only
  4. All of the above

 

Solution: 

(B) I and III only

Explanation:

Solubility is the ability of a solute to dissolve in a solvent.

The factors that affect the solubility of a solute are:

  1. nature of solute;
  2. nature of solvent; and
  3. temperature.
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