Concentration Calculations

• What is the measurement of volume equal to one liter of water?


  One decimeter cubed
• How is concentration calculated?

  Concentration is calculated as mass divided by volume
• What does the formula triangle for concentration represent?

  • Mass = Concentration × Volume
  • Concentration = Mass / Volume
  • Volume = Mass / Concentration
• 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 grams 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 concentration problems?


  Because incorrect units can lead to 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 is the formula to find mass using concentration and volume?

  Mass = Concentration × Volume
• What is the final concentration of a solution if 40 grams of sodium hydroxide is dissolved in 2.5 decimeters cubed of water?


  16 grams per decimeter cubed
• What does the term "per" mean in the context of concentration units?


  It indicates division, as in grams per decimeter cubed
• How can the formula triangle help in rearranging concentration formulas?


  It allows you to cover up the variable you want to find and read the corresponding equation