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Unit 6: What Am I Consuming
6.10: Molarity

What is Concentration?

In a solution, concentration is a measure of the number of particles of the solute in the solvent. A concentrated solution will have a large number of solute particles. A dilute solution will have a smaller number of solute particles. Saying something is concentrated or dilute is not very precise, so we have ways to get an exact measure of the concentration which are molarity and molality. ​

Molarity

Molarity is a measure of concentration.

  • Molarity: The number of moles of solute in 1 liter of a solution
  • Defined as mol/L
  • ​Units are the following: M
    • The unit must be uppercase.
To calculate molarity, you will do the following:
  1. Convert the solute's mass into moles using the substances molar mass.
  2. ​Divide the number of moles of the substance by the number of liters.
  3. Ensure proper units are used.
Watch the following video:
https://www.youtube.com/watch?v=SXf9rDnVFao&feature=youtu.be

Molarity of Sugar in Drinks

Molarity is calculated in units of moles/Liter, so we can use the following conversions to get molarity of sugar in drinks:
  • Molar Mass of Glucose (Sugar) = 180.1559 grams/moles
  • 1 fl.oz. = 0.0295735 Liters
  • 1000 mg = 1 g
  • 1000 mL = 1 L
Example: Finding the Sugar Molarity of Red Bull
Picture
Picture
Example: Finding the caffeine molarity in Coca-Cola
Picture
You can use this process to determine other molarity's in liquid foods and beverages, such as salt and caffeine.
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  • Home
  • Tips and Tricks Blog
  • Science
    • Biology
      • Natural Selection
    • Chemistry
      • Balancing Chemical Equations
      • Covalent Bonds
      • Energy Diagrams
      • Excited Electrons
      • Flame Test
      • Fusion and Fission
      • Half-Life
      • Heat Transfer
      • Intermolecular Forces
      • Ionic Bonds
      • Isotopes
      • Lewis Dot Structures
      • Matter (Part 1)
      • Matter (Part 2)
      • Organic Chemistry
      • Periodic Table (Part 1)
      • Periodic Table (Part 2)
      • Physical Changes and Chemical Reactions
      • Radioactive Decay
      • Solutions and Separation Methods
      • The Atom
      • What is Chemistry?
    • General Science Topics
      • CER
      • Good Research
      • Graphing
      • Lab Equipment
      • Lab Safety
      • Models
      • Scientific Method
    • Labs
    • Veterinary Science
      • Canine
      • Feline
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