Concentrations of Solutions

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

  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?

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

  16 grams per decimeter cubed
• What does the formula triangle represent in this context?

  A way to rearrange formulas easily
• How can we express "per decimeter cubed" in a different notation?

  As $dm^{-3}$
• Why is it important to check the units of the figures given in a problem?

  To avoid common mistakes in calculations
• How do you convert 480 centimeters cubed to decimeters cubed?

  Divide by 1,000
• What mass of hydrogen chloride is in a 400 centimeters cubed sample with a concentration of 20 grams per decimeter cubed?

  8 grams
• What is the first step to find the mass using the formula triangle?

  Multiply concentration by volume
• How do you convert 400 centimeters cubed to decimeters cubed?

  Divide by 1,000 to get 0.4
• What are the steps to calculate concentration?

  1. Identify mass in grams
  2. Identify volume in decimeters cubed
  3. Use the formula: Concentration = Mass / Volume
• What are common pitfalls in concentration calculations?

  • Using incorrect units (grams vs. kilos)
  • Confusing centimeters cubed with decimeters cubed
  • Not converting volumes properly