Measuring Concentration in Chemistry
Measuring Concentration in Chemistry
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Items in this lesson
Measuring Concentration in Chemistry
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What do you already know about concentration in solutions?
Learning Objective
At the end of the lesson you will be able to define solution concentration, calculate mass and molar concentrations, and explain their importance in chemical reactions.
What Is a Solution?
A solution is a liquid mixture where a substance (solute) is dissolved in another (solvent), forming a single, uniform liquid.
What Is Concentration?
Concentration tells us how much solute is present in a certain volume of solution. It is important in chemistry because it affects how reactions happen.
Ways to Measure Concentration
Moles in Volume
Measured in moles per cubic decimetre (mol/dm3). Use: concentration = moles/volume.
Mass in Volume
Measured in grams per cubic decimetre (g/dm3). Use: concentration = mass/volume.
Using the Formula: g/dm3
To find concentration in g/dm3, divide the mass of solute by the volume of solution in dm3. Example: 4g of salt in 2dm3 water = 2g/dm3.
Using the Formula: mol/dm3
For molar concentration, use the moles of solute instead. Example: 0.1 mol in 0.5 dm3 = 0.2 mol/dm3.
Why Is Concentration Important?
Right concentrations are needed for reliable results in experiments and safe chemical reactions.
Quick Recap
• Solution concentration = solute amount/volume • Use g/dm3 or mol/dm3 • Essential for successful chemical reactions
Write down 3 things you learned in this lesson.
Write down 2 things you want to know more about.
Ask 1 question about something you haven't quite understood yet.
