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Acid and Base Titration Curves quiz #1

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Terms in this set (24)

  • What is the main goal of any titration experiment?
    The main goal of any titration is to determine the concentration of an unknown solution by reacting it with a solution of known concentration until the equivalence point is reached.
  • What is the equivalence point in a titration?
    The equivalence point is the stage in a titration where equal moles of acid and base have reacted, resulting in complete neutralization.
  • What type of solution can neutralize a solution of barium hydroxide?
    An acidic solution can neutralize barium hydroxide, which is a strong base.
  • Which color indicates that a titration using phenolphthalein has reached the endpoint?
    A faint pink color indicates the endpoint when using phenolphthalein in a titration.
  • At which point in a titration are the number of moles of analyte and titrant the same?
    The number of moles of analyte and titrant are the same at the equivalence point.
  • What is the first step in the titration process?
    The first step is to add the analyte (unknown solution) to a flask and, if needed, add a suitable indicator.
  • What type of reaction occurs when aqueous hydroiodic acid is mixed with sodium hydroxide?
    A neutralization reaction occurs, producing water and a salt.
  • What is the approximate pH at the equivalence point of a titration curve for a strong acid and strong base?
    The pH at the equivalence point for a strong acid-strong base titration is approximately 7.
  • What is the equivalence point in a titration?
    The equivalence point is when equal moles of acid and base have reacted, resulting in complete neutralization.
  • Which indicator is commonly used to visually observe the endpoint of an acid-base titration?
    Phenolphthalein is commonly used to observe the endpoint in acid-base titrations.
  • How do you know when the moles of acid equal the moles of base in a titration of acid with base?
    You know the moles are equal at the equivalence point, often indicated by a sudden change in pH or a color change from the indicator.
  • Why is phenolphthalein added to an unknown acid before conducting a titration experiment?
    Phenolphthalein is added as an indicator to visually signal when the endpoint of the titration is reached.
  • Which statement best describes the use of a chemical indicator in a titration?
    A chemical indicator is used to signal the endpoint of a titration by changing color when the reaction is complete.
  • What is the equivalence point of a titration?
    The equivalence point is when equal moles of acid and base have reacted, resulting in complete neutralization.
  • What is the purpose of the indicator in acid-base titrations?
    The indicator signals the endpoint of the titration by changing color when neutralization occurs.
  • What do you expect to happen if you forget to add phenolphthalein to the Erlenmeyer flask during a titration?
    If phenolphthalein is not added, you will not see a color change to indicate the endpoint, making it difficult to know when neutralization has occurred.
  • What is the primary species in solution at the halfway point in a titration of HCN with KOH?
    At the halfway point, equal amounts of HCN (weak acid) and its conjugate base (CN-) are present, forming a buffer.
  • Why is it important to be very careful in how much acid is added to neutralize the reaction during a titration?
    It is important because adding too much acid or base can overshoot the equivalence point, leading to inaccurate results.
  • If 42.6 mL of NaOH solution is required to reach the endpoint in a titration, what does this volume represent?
    This volume represents the amount of NaOH needed to completely neutralize the analyte, reaching the equivalence point.
  • What is the last step in performing a titration?
    The last step is to record the final volume of titrant added and calculate the concentration of the unknown solution.
  • When are drops of indicator most likely added to the Erlenmeyer flask during a titration?
    Indicator is added before starting the titration, along with the analyte in the flask.
  • Acid spills can be neutralized by adding which type of substance?
    Acid spills can be neutralized by adding a base.
  • A titration curve is a plot of what on the x-axis and what on the y-axis?
    A titration curve plots the volume of titrant added on the x-axis and the pH of the solution on the y-axis.
  • At the equivalence point for the titration of NH3 with HBr, what is the expected pH?
    At the equivalence point for NH3 (weak base) titrated with HBr (strong acid), the pH is expected to be less than 7.