10 situations to use a burette
1. What is the method of oiling an acid burette?
A: Remove the piston, use a clean paper or cloth to dry the inner wall of the piston and the sleeve. Use a finger to pry a small amount of Vaseline to apply a thin circle on both ends of the piston. Do not apply Vaseline on both sides of the piston hole to avoid blocking. Piston hole, after painting, put the piston back into the sleeve, rotate the piston several times in the same direction, make the Vaseline evenly transparent, then cover it with a rubber band, and fix the piston in the sleeve to prevent slipping out.
2. How to test the acid burette?
Answer: Close the piston, fill the distilled water to a certain line, and erect the burette for about 2 minutes. Observe carefully whether the liquid level on the scribe line is falling, whether there is a water drop at the lower end of the burette, and if there is no water seepage in the piston gap, then turn the piston. Wait at 180 ° for 2 min and observe again. If there is water leakage, re-dry the oil.
3. How to test the basic burette?
Answer: Install distilled water to a certain engraved line, erect the burette for about 2 minutes, and carefully observe whether the liquid level on the scribe line is lowered, or whether there is dripping on the tip of the nipple. If there is water leakage, replace the glass beads in the hose. A suitable size is more sleek and re-tested. Glass beads are too small or not smooth and may leak. It is too inconvenient to operate.
4. How do the acid burettes contain the solution?
Answer: Before loading, the standard solution in the bottle should be shaken to make the water condensed on the inner wall of the bottle mixed into the solution. In order to remove the residual moisture in the burette and ensure the concentration of the standard solution is unchanged, the burette should be rinsed with this standard solution 2– 3 times, about 10mL each time, release a small amount (about 1/3) from the lower mouth to wash the tip portion, the piston should be closed across the burette and slowly rotated to make the solution contact with the inner wall of the tube, and finally the solution Remove from the nozzle and discard it, but do not open the piston to prevent grease from the piston from rushing into the tube. Wash the second time as much as possible after emptying, and rinse the tip of the mouth every time. After 2 to 3 times, you can load the standard solution to above the “0” line.
5. How does the basic burette catch bubbles?
Answer: The alkali burette should bend the hose upwards and squeeze the glass beads hard to spray the solution from the tip to eliminate air bubbles. The bubble of the basic burette is generally hidden near the glass beads. It is necessary to check whether the bubbles in the hose are completely exhausted. After the time, adjust the liquid level to 0.00mL, or record the initial reading.
6. What is the correct way to titrate?
Answer: The timing of the titration should be such that the tip of the burette is inserted into the neck of the conical bottle (or the mouth of the beaker) at 1–2cm. The titration rate should not be too fast. It is suitable for 3–4 drops per second. Under the column flow, shake while shaking. Rotate the circle in the same direction without vibrating back and forth, because the solution will splash out. Near the endpoint, add 1 drop or half drop, and use a bottle to blow a small amount into the inner wall of the conical flask, so that the attached solution flows down, then shake the conical flask to see if the endpoint has been reached. If the end point is not reached, continue the titration until the endpoint is reached accurately.
7. The burette reading should follow the following rules?
Answer: (1) After injecting the solution or releasing the solution, wait for 30s–1min before reading. (2) The burette should be placed vertically on the titration stand or hold the upper end of the burette with two fingers to make it read vertically (3) For colorless solutions or light-colored solutions, the actual lowest point of the lower edge of the meniscus should be read. For colored solutions, the line of sight should be cut to the highest point on both sides of the liquid surface. The first standard is applied for initial reading and final reading.
8. What should I pay attention to when using the burette?
Answer: (1) After using the burette, pour off the remaining solution in the tube, wash it with water, add distilled water to the above level, and use a large test tube to cover the tube. This way, it is not necessary to wash it with the washing liquid before the next use. (2) When the acid burette is not used for a long time, the piston part should be padded with paper. Otherwise, the plug is not easy to open for a long time. When the alkali burette is not in use, the hose should be unplugged and some talcum powder should be stored.
9. What is the type of burette?
A: According to their different volumes, they can be divided into constant, semi-micro and micro-burettes. According to the different structures, they can be divided into ordinary burettes and automatic burettes.
10. The burette has a grease blockage. How to deal with it?
A: If there is old grease in the piston hole, you can use a light wire to gently remove it. If the piping tip is blocked by grease, you can fill the whole pipe with water first, then put the piping tip in hot water to melt and suddenly open the piston. , wash it away.
Nevertheless, WUBOLAB (laboratory glassware manufacturer) has got the best glassware solutions for you. Whatever glassware type or size you require, we are here to provide you with the best quality. Our top-notch glassware comes in various sizes and types; Glass beakers, glass bottles wholesale, boiling flasks, laboratory funnels, and so on. You can find the perfect laboratory glassware for your needs. Besides, if you want a more specialized glassware option, we have specific glassware types. These glassware items offer a wide range of options for your laboratory experiments. Apart from all these, go for our specialized glassware if you want unique laboratory solutions. Lastly, we also have customizable glassware options that will exceed your expectations! So, without any further delay, place your order now!
