Lesson 2.1: Solubility and Concentration

Have you ever made some iced tea and put too much iced tea mix into the pitcher? It tasted much too strong and way too sweet. This is an example of a drink that is too concentrated. Did you ever put so much powder in that some just sat on the bottom of the pitcher and refused to dissolve no matter how much you stirred it? This is an example of solubility.

Read the top half of page 45 in the textbook.

Question 1. Define concentration.

Question 2. What is the solute in the Roundup solution?

Question 3. What do you think the solvent is in the Roundup solution?

Then, return here to continue this lesson.

 

 

That you know about the properties of the products you use is important. Most products have many solutes listed on the labels.

For the following activity, select the solute that is present in the greatest concentration.

  1. Complete the Find Out Activity on page 45 of your textbook.
  2. Complete the table that follows and answer questions 1, 2, and 3 of "What Did You Find Out?".

Commercial Name

Solute

Solvent

Concentration

Then, return here to continue this lesson.

 

 

 

 

 

 

 

 

 

 

 

 

Answers to Questions:

Question 1. Define concentration.

Concentration describes the amount of solute in a solution.

Question 2. What is the solute in the Roundup solution?

The solute is glyphosate.

Question 3. What do you think the solvent is in the Roundup solution?

There is no indication of the solvent on the label. You could assume that the solvent must be water because water is not a hazardous substance and does not need to be included in a label. The third paragraph in the reading tells you the solution is glyphosate and water.

 

Click to return to where you left off in this lesson.

 

Find Out Activity: Concentrations of Consumer Products
Here is one sample answer.

Commercial Name

Solute

Solvent

Concentration
Bleach sodium hypochlorite

water

5%

 

 

 

 

 

 

 

 

 

 

Answers to "What Did You Find Out?" on page 45.

1. Water is likely the most common solvent, but it depends on what products you selected.

2. Products that are not pure substances tend to list concentrations.

3. Government regulations require that manufacturers provide information about the contents.


Click on the page forward to continue lesson 2.

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