moles in solution

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Created by
Jennifer Killelea

Cards (3)

  • titrations are used to find the volumes of acids and alkalis that react together in a neutralisation reaction
  • the reaction is complete when the indicator changes colour
  • the concentration of sodium hydroxide is 1mol/dm^3. In a titration, 20cm^3 of that solution needed 40cm^3 of sulfuric acid for complete reaction. What is the concentration of the sulfuric acid?

    2NaOH + H2SO4 -> Na2SO4 + 2H2O
    V = 20cm^3 =20/1000dm^3 = 0.02 dm^3 - concentration = 1mol/dm^3 V = 40cm^3 = 40/1000dm^3 = 0.04dm^3 - concentration unknown
    n = C x V = 1 x 0.02 = 0.02mol
    number of mol = 0.5 x 0.02 = 0.01
    C = n/V = 0.01/0.04 = 0.25mol/dm^3