GCSE Chemistry (AQA)

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Factors Affecting Concentration

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Quantitative chemistry Use of amount of substance in relation to masses of pure substances

Factors Affecting Concentration

4:11 Calculating Concentration Using Mass and Volume
Spec 4.3.2.5
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  • The concentration of a solution can be changed by altering the quantity of solute or solvent.
  • A solution consists of solid solute particles mixed with a liquid solvent.
  • Concentration measures how tightly packed solute particles are, calculated using the equation: C = M/V.
  • M represents the mass of solute, and V represents the volume of solvent.
  • Example: Dissolving 50 grams of solute in 0.4 decimeters cubed of solvent results in a concentration of 125 grams per decimeter cubed.
  • For exams, you need to calculate concentration and explain how to change it.
  • Concentration depends on mass and volume.
  • Increasing the mass of solute in a set volume increases concentration.
  • Adding more solute particles makes them packed closer, increasing concentration.
  • Doubling the mass of solute doubles the concentration.
  • Removing solute without changing solvent volume decreases concentration.
  • Decreasing solvent volume increases concentration.
  • Evaporating solvent reduces its volume, increasing concentration.
  • Example: Evaporating half the solvent results in a concentration of 250 grams per decimeter cubed.
  • Halving the solvent volume doubles the concentration.
  • Adding more solvent without changing solute decreases concentration.

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