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Learn about solutions, concentration, and solubility through this lesson.
Get this lesson: You can download the full packet here or read a condensed version of this unit below.
Worksheet: Download just the worksheet or there’s a copy included in the packet.
There are three foundational concepts that are useful to understand when thinking about chemistry. These concepts explain how substances either mix together to form a new substance, or dissolve in one another creating a mixture.
Solution: a special type of homogeneous mixture composed of two or more substances. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.
Concentration: the abundance of a constituent divided by the total volume of a mixture. E.g the amount of salt in a water solution.
Solubility: a property referring to the ability for a given substance, the solute, to dissolve in a solvent, such as water.
The solubility of a majority of solid substances increases as temperature increases. In the suggested research project, students can see how you can dissolve more salt in water as you heat up the water.
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Sample Research Project:
Create a super saturated solution: use water and common table salt to understand the concentration of solutions. When a solvent is heated, it can dissolve more of a solute than when it is cool.
Methods and materials: This article describes how to do the experiment.
- Table salt
- Heat source
- Heat proof container
Sample Research Questions:
- Does more solute dissolve when the solute is hot or cold?
- Does a super saturated solution appear different than a saturated or unsaturated solution?
- How can I test to know that a solution is super saturated?
This unit provides foundational knowledge for working with standard HS-PS1-5
SEPs: Analyzing and interpreting data
Systems and system models
CC: Cause and effect
Stability and change