Titrations Flashcards

1
Q

Creating a standard solution (6)

A
  1. Using the concentration and volume of the desired solution, calculate the mass of
    reactant needed.
  2. Use a mass balance to weigh the required amount of reactant into a small
    beaker.
  3. Dissolve the mass in approximately 50 cm3 of deionized water. Use a stirring rod
    to assist.
  4. Transfer the solution to a 250 cm3 volumetric flask.
  5. Rinse the beaker and stirring rod at least three times and pour the washings into
    the volumetric flask.
  6. Fill the volumetric flask up to the mark with deionized water and shake to mix.
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2
Q

Performing a titration (7)

A
  1. Fill the burette with the standard solution.
  2. Using a pipette (or second burette), add a known volume of the unknown
    reactant into a conical flask.
  3. Add a few drops of a suitable indicator to the solution in the conical flask.
  4. Place the conical flask on a white tile to allow colour changes to be seen easily.
  5. Add the standard solution, slowly, to the solution in the conical flask while the
    flask is swirled
  6. The endpoint is reached when adding one more drop from the burette will
    change the colour of the solution in the conical flask.
  7. A titration should always be repeated until two consecutive values within a range
    of 0,10 cm3 is achieved (this means that your results are precise).
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