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Dilutions quiz

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  • What is a standard or stock solution in chemistry?
    A standard or stock solution is a concentrated solution that is later diluted for laboratory use.
  • What does the process of dilution involve?
    Dilution involves adding more solvent, usually water, to a solution to decrease its concentration.
  • How does the color of a solution typically change during dilution?
    The color changes from a darker shade to a lighter shade, indicating a reduction in concentration.
  • What happens to the molarity of a solution when it is diluted?
    The molarity decreases, going from a higher value to a lower value.
  • What is the equation used to calculate dilutions?
    The dilution equation is M1V1 = M2V2.
  • In the dilution equation, what do M1 and V1 represent?
    M1 and V1 are the molarity and volume before dilution.
  • In the dilution equation, what do M2 and V2 represent?
    M2 and V2 are the molarity and volume after dilution.
  • Which is greater, M1 or M2, and why?
    M1 is always greater than M2 because it represents the more concentrated solution before dilution.
  • How is the final volume after dilution (V2) calculated?
    V2 is calculated by adding the initial volume (V1) to the volume of solvent added.
  • What is the main purpose of performing a dilution in the laboratory?
    The main purpose is to create a solution with a lower concentration from a more concentrated stock solution.
  • What visual cue indicates that a solution has been diluted?
    The solution becomes a lighter color, showing it is less concentrated.
  • If you start with a dark purple solution and add water, what happens to its concentration?
    Its concentration decreases as the solution becomes more diluted.
  • Why is water commonly used as the solvent in dilutions?
    Water is commonly used because it is a universal solvent and does not react with most solutes.
  • What does V1 represent in the context of a dilution?
    V1 represents the initial volume of the concentrated solution before dilution.
  • What does the equation M1V1 = M2V2 ensure during a dilution?
    It ensures that the amount of solute remains constant before and after dilution.