How to Find Concentration

• What is the unit of concentration in the context of this video?

  Grams per decimeter cubed
• What is a decimeter cubed equivalent to in centimeters cubed?

  1,000 centimeters cubed
• How is the concentration of a solution calculated?

  By dividing mass by volume
• What does the horizontal line in a formula triangle represent?

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

  Multiplication
• If you have 40 grams of sodium hydroxide in 2.5 decimeters cubed of water, what is the concentration?

  16 grams per decimeter cubed
• How can we express "per decimeter cubed" in a different notation?

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

  By dividing by 1000 to get 0.48 decimeters cubed
• 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 of the figures given in a problem?

  To avoid common mistakes in calculations
• If a sample of hydrochloric acid has a concentration of 20 grams per decimeter cubed and a volume of 400 centimeters cubed, what mass of hydrogen chloride is in the solution?

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

  By dividing by 1000 to get 0.4 decimeters cubed
• What calculation do you perform to find the mass using concentration and volume?

  Mass equals concentration times volume
• What is the final mass of hydrogen chloride in the hydrochloric acid sample?

  8 grams