Buret to use - Shenyang laboratory supplies - Yutang experimental equipment

Buret Buret is a gauge used to accurately measure the volume of the standard solution titration operation. There on the wall tick Buret and value, the minimum scale of 0.1 ml, and "0" on the scale, top-down value from small to big. Buret Buret two kinds of sub-acid and alkaline Buret. Acid burette lower end of the glass cock to spill control solutions. Acid burette can only be used to dress acidic solution or an oxidizing solution, not containing alkaline solution, due to the base effect will wear mouth with a glass cock-blocking and can not move, there is a basic burette lower end of the hose is connected, there is a glass bead tube to control the outflow of the liquid, the hose connecting the lower end of a glass tube beak. Who can work with the rubber solution such as AgNO3, KMnO4, I2 solution, you can not use the basic burette. First, use acids burette (1) washing. Typically Buret tube brush dipped in tap water or detergent (not use scouring powder) wash, then rinse with tap water, washed three times with deionized water run. There are washing Buret use chromic acid lotion greasy. (2) to cock coated with Vaseline (acts sealed and lubricated). The water in the pipes drained, flat on the table, remove the faucet, taps and plugs with filter paper dry up the water tank. With a finger dipped in a little Vaseline, two cock core coated with a thin layer (at no catheter coated with Vaseline), then insert the cock plug slot, rotate several times to film in a uniform and transparent cocks, and cocks flexible rotation. (3) leak. The tap is closed, the burette was filled with water, put it in Buret fixed shelves, for 10 minutes, observe burette mouth and cock both ends whether there is water leakage, cocks impervious before use. (4) into the standard solution after burette to check whether there are air bubbles inside the beak. If bubbles will affect the accuracy of the measurement solution volume. Remove air bubbles is: Hold burette with the right hand part so that no scale inclined by about 30 ° angle, left quickly open the faucet, the solution was quickly out of the bubble away. (5) means the standard solution. It should use the standard solution (5-6ml) Rinse burette 3 times, wash the inner wall of the water film, to ensure the same standard concentration. The method is hands flat end Buret while slowly rotating to make contact with the entire inner wall of the standard solution, and the solution flows out from the lower end of the burette. When loading standard solution was to shake, then do not use any containers directly into the burette. (6) titration operation, should be caught in Buret Buret rack. Left control cock thumb in front pipe, forefinger and middle finger, the third finger with light tap handle, fingers slightly curved inward withhold cocks, to avoid making a spin Sierra force. Inward rotation of the tap dripping out of the solution. Buret tapered bottle should be inserted 1-2cm, right hand holding the bottle, continued clockwise rotation of the solution bottle. Master titration rate (continuously dropped, added dropwise, half drops plus), before the end with a bottle wash bottle wall, then continue titration to the end. (7) Buret after use, should be washed open cock upside down burette stand. Second, the use of basic burette (1) leak. After basic burette filled with water to a folder in Buret shelf stand for 5 minutes. If leakage should be replaced glass beads inside the hose or tube until watertight and can flexibly control the droplet so far. After loading standard solution (2) Buret bubble is discharged to the bill. The method is: the hose bent upward, the outlet oblique, squeezes glass beads, and the solution was quickly ejected from the beak, bubbles can subsequently drain. (3) When the titration operation, with the left thumb and forefinger and glass beads on the middle portion of the hose outward, palms direction to squeeze a rubber tube, forming a gap between it and the glass beads, the solution can flow out . Other operating with Acid burette. Third, note the following when using Buret points: (1) before and after use should be using burette washed. To acid wash before burette cock closed. After injecting water pipe in one hand and hold the upper burette no scale where no scale in one hand and hold the top place to tap or hose while rotating the nozzle tilt Buret side, the water soaked the whole tube. Then Buret upright, open cock or squeeze the water out of the hose from the beak mouth. Buret clean standard is not linked to the inner wall of the glass tube drops. (2) use in Buret Buret must be fixed shelves. When reading burette reading, to make burette vertical, sight should be a horizontal plane, to 1-2 minutes after loading fluid or subretinal fluid meniscus along the lower lows. Colored solution should be the highest point of the line of sight to the solution and Buret surface on both sides at the level of the eye was. It must be adjusted first reading between 0.00 and scale or level 0-1 scale. After reading to the second decimal place (0.01ml), see right. (3) prior to titration, buret beak part can not leave the bubble, the bill can not be hung outside the droplets; titration endpoint, Buret beak if hanging drops outside, the volume should titration (usually standard solution) deduction, the standard acid burette, 1 drop of 0.05mL. (4) to use a dilute solution of acid-base titration, titration should be looking at the change in eye color Erlenmeyer flask, and can not see Buret. (5) drip: soon after the first slow drip drip (not connected to the water column), when close to the end, should drop a shake. (6) End: The last drop of just cause significant change in the indicator color changes and does not restore its original color within 0.5min, read out at the end of the volume, record. Fourth, the indicator of choice 1. Phenolphthalein: an acid base titration, color from red to just fade. When acid base titration, just red color from colorless to. 2. Methyl orange: an acid base titration, in color from yellow to orange. When acid base titration, color from red to orange. 3. Litmus: color is not obvious, the titration endpoint solution should observe the color change, it is in general not litmus indicator and titration. 4. Strong acid and weak base neutralization titration should be selected methyl orange as indicator. Strong base and a weak acid and titration should be selected phenolphthalein as an indicator. Acid and alkali neutralization titration can choose phenolphthalein or methyl orange. Fifth, error analysis (a) high. Common as follows: 1. After loading the standard solution Buret not rinse water, which means standard solution. 2. Wash the flask with the test solution Run. 3. Buret Sheng standard solution before the titration in the beak bubbles, the bubble disappears after the titration. 4. After titration burette beak at the hanging droplets. 5. Titration standard liquid spilled outside the flask. 6. Pipette when taking the test solution does not comply with the principles of gravity solution, and mouth blown. 7. After titration bottom readouts. 8. Titration top view type before reading. (B) low. Common as follows: 1. When used burette (or pipette) to take the test solution, the burette (or pipette) was washed with water that is not rinsed take the test solution. 2. Titration test solution spill. 3. Titration reading before looking up style. 4. After the titration a plan readouts. --------------------------------------------- Yutang experimental equipment Co., Ltd. is specialized in the development of test equipment, manufacturing and marketing of high-tech joint-stock enterprises, China Coal Research Institute sentinel laboratory equipment of professional manufacturers, the National Standardization Management Committee, the provincial units of measurement. We focus on coal, metallurgy, electric power, petrochemical, cement, and other research institutions to provide laboratory equipment and laboratory overall configuration and coal combustion-related fields, including test equipment, laboratory testing equipment is the company's main products in the domestic market on have a high visibility and credibility. Yutang Analytical Technologies bit Songbei New Industrial Park, covering more than 1,000 square meters, the company has long been engaged in a large number of coal quality analysis equipment design, manufacturing and related professional and technical personnel. High-quality workforce, advanced production equipment and testing instruments, strong economic strength and a sound marketing and service system, is the foundation and guarantee long-term development of the company. In the long-term production and marketing practice, church language test equipment company and give full play to their strengths, track, learn the latest developments in the relevant art, focusing on comments absorb experts and users; with a new design concept, fully research the market, highlighting innovation. Companies rely on first-class team of engineers and a variety of unique, proprietary technology, we continue to develop a variety of top products. The company has developed a calorimeter, sulfur meter, industrial analyzers, muffle furnace, ash melting point detector and moisture analyzer and other products, declared a number of patents. Yutang experimental equipment company's products have formed six series, dozens of different specifications, with a wide range of domestic and some international markets, its professional level and market performance by the majority of customers and expert recognition and praise, and establish a good brand image! Only with advanced product is not enough to maintain a win-win with customers to establish long-term partnership is Yutang experimental equipment company persistent goal. We have production and other functions of the institutions reformed to effectively shorten our production cycle and delivery time. We believe that this series of initiatives will produce significant results. In addition, language church experimental equipment company can provide users with a wide range of services, including new product upgrades, professional and technical guidance field application engineer for special applications to provide a complete reference design and ordering, inquiry, humane delivery channels support and more. Yutang experimental equipment company engineers never passively waiting for the customer's new demands. To ensure that time is at the forefront of industrial development, we are committed to maintaining close and forward-looking partnership with our customers. Not only do we help our customers achieve their vision, but also on the client's ideas were pioneering and innovation, to provide customers did not expect, but it may be the product design and production capabilities required for the application. "Think customers are thinking, be anxious customers the way", we will this goal as their duties. With the gradually further improve and scale advantages of the company management system, language church experimental equipment company will continue to blaze new trails, to better serve the market, service users! Tel: 0451-84511569 Mobile: 18604605369 official website: www.hljytkj.cn www.hljytkj.com www.hljytkj.net Harbin's official website: hrb.hljytkj.com hrb.hljytkj.cn Qiqihar official website: qqhr.hljytkj.com qqhr.hljytkj. cn Changchun's official website: cc.hljytkj.com cc.hljytkj.cn Shenyang official website: sy.hljytkj.com sy.hljytkj.cn Dalian official website: dl.hljytkj.com dl.hljytkj.cn Beijing's official website: bj.hljytkj.com bj. hljytkj.cn Shanghai official website: sh.hljytkj.com sh.hljytkj.cn www.xhst.cc