Technique Reason Rinse the burette with acid before use Ensure that any water or other substance left in the burette is washed out Ensure the tap is full of liquid before use (with no Ensure that the volume change is exactly the air bubbles) same as the volume of liquid delivered Record all burette readings to 2 dp Ensure that all readings are made to the nearest drip Ensure the reading is taken from the base of the Ensure that the correct volume delivered is meniscus calculated Ensure that the pipette delivers the correct Allow the pipette to empty under gravity volume (not too much) Touch the surface of the liquid with the pipette Ensure that the pipette delivers the correct tip after emptying volume (not too little) Add only two drops of indicator Because indicators are acidic and will affect the equivalence point Add the acid dropwise at the end point Ensure that the equivalence point is seen as it happens Rinse the top of the conical flask with distilled Ensure that any acid or alkali is washed into the water during the titration conical flask Rinse the conical flask with distilled water after Ensure there are no moles of acid or alkali left use behind
Technique Reason Rinse the burette with acid before use Ensure that any water or other substance left in the burette is washed out Ensure the tap is full of liquid before use (with no air bubbles) Ensure that the volume change is exactly the same as the volume of liquid delivered Record all burette readings to 2 dp Ensure that all readings are made to the nearest drip Ensure the reading is taken from the base of the meniscus Ensure that the correct volume delivered is calculated Allow the pipette to empty under gravity Ensure that the pipette delivers the correct volume (not too much) Touch the surface of the liquid with the pipette tip after emptying Ensure that the pipette delivers the correct volume (not too little) Add only two drops of indicator Because indicators are acidic and will affect the equivalence point Add the acid dropwise at the end point Ensure that the equivalence point is seen as it happens Rinse the top of the conical flask with distilled water during the titration Ensure that any acid or alkali is washed into the conical flask Rinse the conical flask with distilled water after use Ensure there are no moles of acid or alkali left behind
practical_techniques_for_topic_2.docx