concentration of solutions]

• What should you be able to calculate by the end of the video?

  The concentration of a solution in grams per decimeter cubed
• What does concentration tell us about a solution?


  It tells us the mass of a solute in a given volume of solution
• What is a solute?


  A chemical which is dissolved in a solvent
• What is commonly used as a solvent in chemistry?


  Water
• What is the unit of concentration for this definition?

  Grams per decimeter cubed (g/dm³)
• What does the term "decimeter cubed" refer to?


  It is equivalent to what used to be called a liter
• How do you calculate the concentration of a solution?

  Concentration = mass in grams / volume in decimeter cubed
• If 200 g of a chemical is dissolved in water to a final volume of 1 dm³, what is the concentration?


  200 g/dm³
• What is the concentration if 150 g of a chemical is dissolved in water to a final volume of 0.5 dm³?


  300 g/dm³
• How do you calculate the mass of a chemical needed to achieve a concentration of 600 g/dm³ in a volume of 0.4 dm³?


  Mass = concentration × volume = 240 g
• What is the final volume of a solution containing 200 g of a chemical with a concentration of 800 g/dm³?


  0.25 dm³
• How do the mass of the solute and the volume of the solution affect concentration?


  • Increasing the mass of solute (keeping volume constant) increases concentration.
  • Increasing the volume of solution (keeping mass constant) decreases concentration.
• What additional resource is mentioned for more questions on concentration?


  A revision workbook
• What should higher tier students be able to explain regarding concentration?


  How the mass of the solute and the volume of the solution affect the concentration