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Calculate mass from solution concentration

Quantitative chemistry • Amount of substance and mass

Key concepts

What you'll likely be quizzed about

  • Concentration quantifies the mass of solute dissolved in a specific volume of solution.
  • The unit for calculations is grams per cubic decimetre (g/dm3), or g dm-3.
  • Adding more solute increases the mass concentration.
  • Consequently, concentration rises when solute mass increases, maintaining a constant volume.

Flashcards

Test your knowledge with interactive flashcards

What unit checks for mass = concentration × volume when concentration is in g/dm3?

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g/dm3 multiplied by dm3 gives grams; unit consistency ensures accurate mass units.

Key notes

Important points to keep in mind

Use mass = concentration × volume and keep units consistent (volume in dm3 for g/dm3).

Convert cm3 to dm3 by dividing by 1000 before calculations.

Relate molar and mass concentration via molar mass: ρ = c × Mr.

Temperature and solubility limits affect achievable concentrations.

Round final answers to reflect the precision of given data.

Check units to avoid common errors (e.g., forgetting dm3).

If solute exceeds solubility, undissolved solid does not affect concentration.

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