2A 1b Titration techniques

Quiz

Before using a conical flask it should be rinsed with
1. water.
2. the solution it will contain.
Before using a volumetric flask it should be rinsed with
1. water.
2. the solution it will contain.
Before using a burette it should be rinsed with
1. water.
2. the solution it will contain.
Before using a pipette it should be rinsed with
1. water.
2. the solution it will contain.
Air bubbles trapped in a filled burette are
1. OK in the tube, but not in the tip of the burette.
2. OK at the tip of the burette, but not in the tube.
3. not OK anywhere in the burette.
Is it OK to use a funnel when filling a burette?
1. Yes – it can be left in the burette to make it easy to refill the burette when needed.
2. Yes – provided you remove the funnel from the burette before doing each titration.
3. No – it is too easy to break a burette by putting a funnel into it.
Is it OK to force out the liquid from a slow-draining pipette?
1. Yes – the speed of draining makes no difference to the volume transferred.
2. Yes – but make sure you touch the tip of the pipette to the glass afterwards to remove the final drop.
3. No – because forcing the liquid out removes a drop that is meant to remain in the pipette.
Is it OK to rinse the sides of the flask with distilled water during the titration?
1. Yes because it will make sure all the reagent in the flask reacts.
2. No, because it will dilute the solutions and change the result.
While doing the titration
1. squirt liquid from the burette in and then swirl the flask.
2. swirl the flask before adding liquid from the burette.
3. squirt liquid from the burette in while you swirl the flask.
Select the concordant results from this group of titres.
1. 28.96 mL
2. 28.68 mL
3. 28.72 mL
4. 26.65 mL
5. 28.70 mL
Select the concordant results from this group of titres.
1. 13.36 mL
2. 12.50 mL
3. 13.96 mL
4. 11.78 mL
5. 13.42 mL
Select the concordant results from this group of titres.
1. 20.4 mL
2. 19.7 mL
3. 19.8 mL
4. 20.1 mL
5. 19.8 mL