Use a funnel and fill the buret above the 0.0 mark with titrant. Make sure the stopcock is closed, and that you not pouring a chemical above eye level. You may need to unclip the buret from the stand when filling or refilling.Ĩ. When filling the buret, do so at eye level and always use a funnel. Also dispose of this aliquot in your waste beaker.Ħ. Rinse the interior of the buret with about 5mL of your titrant as above. Drain the rinse solution through the stopcock into the waste beaker.ĥ. Make sure the solution comes into contact with every surface in the interior of the buret by rotating the buret. Be careful not to spill the solution (you can use parafilm to cover the open end of the buret).
To properly wet the inside surfaces, tip the buret on its side while holding it in your hand. Rinse the interior of the buret with about 5mL of your titrant, dispose of this aliquot in your waste beaker. Rinse the interior of the buret with deionized water.Ĥ. Rinse the interior of the buret with tap water.ģ. First clean the buret with tap water and a buret brush (if available).Ģ. The correct procedure for preparation of a buret for titration of a strong acid with a strong base:ġ. How many times should you rinse a pipet before transferring liquid?ġ.1. The pipet was calibrated to deliver the correct volume with this liquid remaining. Do no blow this remaining liquid from the pipet. There may be some liquid remaining in the pipet tip. Allow the pipet to drain into the container and touch off any last drop on the pipet side of the glassware. When the liquid level is at the correct place, move the pipet tip to the glassware where you want the liquid delivered and release your finger. Now allow the liquid level to drop to the required level by slowly allowing air to enter the pipet by a controlled lifting of the finger that is covering the end of the pipet. Remove the bulb while simultaneously covering the tip of the pipet with your finger. Once again, draw in the liquid to be measured above the calibration line in the pipet. Dispose of this first amount of liquid into a waste beaker.
Be careful not to draw the liquid into the bulb. Keep the pipet tip submerged to avoid air bubble entry. Place the tip of the pipet in the liquid and draw the liquid into the pipet and above the calibration line. You may want to lubricate the hole of the rubber bulb with a drop of deionized water. The bulb only needs to cover the end of the pipet to create an airtight seal, there is no need to push the pipet farther into the bulb. Compress the rubber bulb and place it carefully over the upper end of the pipet.
First clean and rinse your pipet with tap water and do a second rinse with deionized water. The correct procedure for transferring liquid with a volumetric pipet.
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