3.4 Using concentrations of solutions in mol/dm³

    Cards (74)

    • What is measured in grams (g)?
      Mass
    • What is the formula for molar concentration?
      Concentration = moles/volume
    • The formula for molar concentration is concentration=concentration =number of molesvolume (dm3) \frac{number\ of\ moles}{volume\ (dm^{3})}, where volume is measured in dm³
    • What is the SI unit for the amount of substance?
      Mole
    • Molar concentration indicates the number of moles of solute in one liter of solution.
      True
    • A mole contains the same number of particles as there are atoms in 12 grams of carbon-12.

      True
    • Molar concentration is expressed in moles per cubic decimeter (mol/dm³).
      True
    • What is the relationship between moles, mass, and number of particles?
      Moles relate to mass and particles
    • How many grams of carbon-12 are used to define a mole?
      12 grams
    • The mole represents a specific number of particles, regardless of the substance.

      True
    • Molar concentration is expressed in units of moles per cubic decimeter
    • What does the molar concentration formula measure?
      Amount of solute
    • A solution containing 0.5 moles of NaCl in 2 dm³ of water has a concentration of 0.25 mol/dm³
    • A 1.5 dm³ solution with a molar concentration of 0.2 mol/dm³ contains 0.3 moles of solute.
    • The formula for molar concentration is concentration
    • To calculate the volume of a solution, you divide the number of moles by the molar concentration.

      True
    • The mole is the unit for the amount of substance.

      True
    • Match the quantity with its definition:
      Moles ↔️ Unit for amount of substance
      Mass ↔️ Amount of substance in grams
      Number of particles ↔️ Atoms, molecules, or ions
    • If 0.5 moles of NaCl are dissolved in 2 dm³ of solution, the molar concentration is 0.25 mol/dm³.

      True
    • The concentration of a solution is defined as the number of moles of solute per volume of solution.
    • To calculate the number of moles, you multiply the concentration by the volume.
    • The formula to calculate moles from molar concentration and volume is moles = concentration × volume.

      True
    • Match the quantity with its unit:
      Volume ↔️ dm³
      Moles ↔️ mol
      Concentration ↔️ mol/dm³
    • A molar concentration of 0.25 mol/dm³ is equivalent to 250,000 ppm.
    • To convert mol/dm³ to g/dm³, you multiply by the molar mass of the substance.

      True
    • A solution with 14.61 g/dm³ of NaCl is equivalent to 250,000 ppm.
      True
    • What is the molar mass of NaCl?
      58.44 g/mol
    • To dilute the HCl solution to 0.1 mol/dm³, 400 cm³ of water should be added.
    • The volume in the molar concentration formula must be in cubic decimeters (dm³).

      True
    • The concentration of a solution is always expressed in moles per cubic meter.
      False
    • The number of moles in a solution can only be calculated if the volume is in liters.
      False
    • What is the formula for calculating the number of moles from molar concentration and volume?
      n=n =C×V C \times V
    • What is the formula for calculating the volume of a solution given the number of moles and concentration?
      V=V =nC \frac{n}{C}
    • The mole is defined as the amount of substance that contains the same number of particles as there are atoms in 12 grams of carbon-12
    • What is molar concentration also known as?
      Molarity
    • What do you divide the number of moles by to calculate molar concentration?
      Volume in dm³
    • Molar concentration is also known as molarity.

      True
    • What is the number of moles in a 2.5 dm³ solution with a concentration of 0.3 mol/dm³?
      0.75 mol
    • The formula to calculate volume from moles and concentration is volume=volume =molesconcentration \frac{moles}{concentration}, where the volume is in dm³.
    • To convert molar concentration from mol/dm³ to g/dm³, you multiply by the molar mass.
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