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Volumetric Analysis

Volumetric Analysis

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Volumetric Analysis

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  1. Volumetric Analysis Apparatus

  2. The Volumetric Flask

  3. Volumetric Flask • Weigh out a specific mass of solute on a clean, dry clock glass. • Add the solute to a beaker containing a small volume of water. • Using a wash bottle wash all traces of the solute from the clock glass into the beaker. • Stir the mixture with a clean glass rod.

  4. Volumetric Flask • Using a funnel transfer the contents of the beaker into a clean dry volumetric flask. • Wash all traces from the beaker, glass rod and funnel into the flask. • Continue to add deionised water into the flask until the level is just below the mark on the flask.

  5. Volumetric Analysis • Using a dropper fill the rest of the volumetric flask until the bottom of the meniscus is on the mark.

  6. Volumetric Analysis • Stopper the flask and invert about 30 times. • This ensures the mixture is homogenous.

  7. The Pipette

  8. The Pipette • Rinse with deionised water. • Rinse with some of the solution it is to contain. • Use a pipette filler to draw the level of the liquid to above the mark. • Allow the liquid to run into a waste beaker until the bottom of the meniscus is on the mark.

  9. The Pipette • Touch the pipette against the side of a glass beaker. This will remove any droplet of liquid that might be adhering to the pipette. • Allow the liquid to drain under gravity in to the conical flask. • Touch the tip of the pipette to the side of the flask but do not blow the last drop out.

  10. The Burette

  11. The Burette • Rinse with deionised water. • Rinse with some of the solution it is to contain. • Use a small funnel when filling the burette. • The burette is filled almost to the top and then the tap is opened to fill the part below the tap. • Re-fill the burette until the bottom of the meniscus is on the mark.

  12. Conical Flask

  13. Conical Flask • Its design allows it to be swirled without the solution splashing out. • Before use, wash out with deionised water. • Do not wash out with the solution it is to contain. • It will be holding an exact volume of a solution and so if it was washed prior to this it would have droplets that would affect this volume.