Concentration
How much of a substance is dissolved in a given volume of solution. It is often measured in grams per dm3 or in moles per dm3.
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Analogy
Squash with a lot of syrup in a cup is more concentrated than squash with a little syrup.
Example
Concentration = mass / volume10 g in 2 dm3= 5 g/dm3
In practice
A solution with 10 g in 2 dm3 has a concentration of 5 g/dm3.
Practice
Flashcards
- How do you calculate concentration in g/dm3?Mass of solute in grams divided by volume in dm3.
Questions people ask
How do you convert cm3 to dm3?
Divide by 1,000. There are 1,000 cm3 in 1 dm3, which is the same as one litre. So 250 cm3 is 0.25 dm3. Always convert before calculating concentration or moles in a solution, as formulae use dm3 as the unit of volume.
What does a concentration of 2 mol/dm3 mean?
It means there are 2 moles of dissolved substance in every 1 dm3 of solution. Multiply concentration by volume in dm3 to get moles. So 0.5 dm3 of a 2 mol/dm3 solution contains 1 mole. A higher number means a more concentrated solution.