Concentrations of solutions

• What is the unit for measuring concentration in this context?

  Grams per decimeter cubed
• How many centimeters cubed are in one decimeter cubed?

  1,000 centimeters cubed
• What is the equation for concentration?

  Mass divided by volume
• What does the horizontal line in a formula triangle represent?

  Division
• What does the vertical line in a formula triangle represent?

  Multiplication
• How would you find concentration using the formula triangle?

  Mass divided by volume
• If you have mass and concentration, how do you find volume?

  Mass divided by concentration
• What is the concentration of 40 grams of sodium hydroxide in 2.5 decimeters cubed?

  16 grams per decimeter cubed
• How can we express grams per decimeter cubed in another notation?

  As $dm^{-3}$
• How do you convert 480 centimeters cubed to decimeters cubed?

  Divide by 1,000
• What is the concentration of 24 grams of copper sulfate in 480 centimeters cubed of water?

  50 grams per decimeter cubed
• Why is it important to check the units in concentration problems?

  To avoid common exam mistakes
• How do you find the mass if you know concentration and volume?

  Concentration times volume
• What is the mass of hydrogen chloride in a 400 centimeters cubed sample with a concentration of 20 grams per decimeter cubed?

  8 grams
• How do you convert 400 centimeters cubed to decimeters cubed?

  Divide by 1,000
• What are the steps to calculate concentration?

  1. Identify mass and volume.
  2. Ensure units are consistent.
  3. Use the formula: concentration = mass / volume.
  4. Convert units if necessary.
• What are common pitfalls in concentration calculations?

  • Incorrect unit conversions
  • Misunderstanding the formula
  • Confusing mass and volume