Titrations Flashcards
1
Q
Creating a standard solution (6)
A
- Using the concentration and volume of the desired solution, calculate the mass of
reactant needed. - Use a mass balance to weigh the required amount of reactant into a small
beaker. - Dissolve the mass in approximately 50 cm3 of deionized water. Use a stirring rod
to assist. - Transfer the solution to a 250 cm3 volumetric flask.
- Rinse the beaker and stirring rod at least three times and pour the washings into
the volumetric flask. - Fill the volumetric flask up to the mark with deionized water and shake to mix.
2
Q
Performing a titration (7)
A
- Fill the burette with the standard solution.
- Using a pipette (or second burette), add a known volume of the unknown
reactant into a conical flask. - Add a few drops of a suitable indicator to the solution in the conical flask.
- Place the conical flask on a white tile to allow colour changes to be seen easily.
- Add the standard solution, slowly, to the solution in the conical flask while the
flask is swirled - The endpoint is reached when adding one more drop from the burette will
change the colour of the solution in the conical flask. - 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).