Concentration

Concentration

• Many chemical reactions take place in solutions.
• Concentration is the amount of a substance per unit volume .
• The concentration of a solution can be measured in mass per given volume of solution, moles per given volume or volume per given volume.
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Slide 2

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• Legenda: Cover the aspect of the triangle that you would like to find, then multiply if the remaining aspects are horizontal neighbours, or divide if they touch vertically.

Example

• 80g of copper (II) sulfate is dissolved in 500ml of water. What is the concentration of the solution in terms of \(\text{mol }dm^{-3}\)?
• The molar mass of copper(II) sulfate is 160g. Therefore, we have dissolved 0.5 mole in 0.5 \(dm^{3}\) of solution.
• This is the same as dissolving 1 mole in 1 \(dm^{3}\) of solution.
• This means the concentration is \(\text{1 mol }dm^{-3}\)