Methods of filling, venting, and reading the Laboratory Burette

Methods of filling, venting, and reading the Laboratory Burette

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Liquid
In order to prevent the solution filled in the burette from being diluted by the water on the inner wall of the burette, the burette must be rinsed with the filled solution first. Inject about 5″ 6 ml of the solution filled by the person, and then turn the flat-end burette with both hands slowly to make the solution flow all over the tube. Open the piston of the titration arm and let the dampening solution flow out from the lower end of the tube mouth. Rinse 2-3 times in this way After that, the solution can be used. When filling the solution, it should be directly injected into the burette from the reagent bottle, and do not pass through other containers such as funnels.

Exhaust
When the solution is loaded into the burette, the outlet tube is not full of solution. Tilt the acid burette about 30 at this time. , The left hand quickly opens the piston to flush out the solution, and all the outlet pipes can be filled. If using an alkaline burette, bend the rubber tube upwards and the glass tip diagonally upwards. Squeeze the glass beads with two fingers to make the solution spray out of the outlet tube. The bubbles escape. After the bubbles are eliminated, add the solution to above the mark, and then turn the piston or squeeze the glass beads to adjust the liquid level at the 0.00ml mark or slightly below the “0″ mark.

Reading
When reading, remove the burette from the rack, and hold the burette above the liquid surface with the thumb and index finger of your right hand, so that the titration camp is perpendicular to the ground.
When reading, the line of sight must be kept on the same level as the liquid level. For colorless or light-colored solutions, read the scale at the low point of the lower edge of their meniscus; for dark solutions such as potassium permanganate, iodine, etc., read the scale at the high points on both sides. If there is a blue band on the back of the burette, the colorless solution has formed two meniscuses at this time, and they intersect on the midline of the blue line, and the scale of the intersection point is read when reading: if it is a dark solution, still read The scale of the high points on both sides of the liquid level. In order to make the reading clear, you can also line the burette with a piece of paper as the background to form a deeper meniscus. The lower edge of the meniscus is not affected by light and is easy to observe. Every time the titration is done, the solution is filled to the “o.oo” milliliter scale of the burette or started slightly lower, which can eliminate errors caused by uneven upper and lower scales. The reading should be read to the second decimal place after the milliliter, that is, it is required to estimate to 0.01ml.

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Post time: Oct-18-2021

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