The acid burette is used to measure the liquid that corrodes the glass, and the basic burette is used to measure the liquid reagent that corrodes the rubber tube.
Burette is the most basic gauge in titration analysis. The burette used for constant analysis has several specifications, such as 50ml and 25ml. Their minimum division value is 0.1ml, and the reading can be estimated to be 0.01ml.
In addition, the micro burette has a volume of 0.050.5ml, and the micro burette has a volume of 0.050.5ml. They have different shapes.
According to different devices for controlling the flow rate of solution, burette can be divided into acid type and basic type. The lower end of the acid burette is equipped with a glass piston to hold acidic or oxidizing solutions.
The lower end of the basic burette is connected with a small glass tube with a latex tube. There is a glass bead in the latex tube to control the outflow of the solution. The basic tube is used to hold alkaline solution and non oxidizing solution. The liquid in the lower sharp mouth is not within the scale, and the liquid in the sharp mouth cannot be discharged when measuring or titrating the solution.
Before filling the cleaned burette, the inner wall of the burette should be moistened with the solution to be filled for three times, and the dosage is about 10ml, 5ml and 5ml in turn. For the burette filled with solution, check whether there are bubbles at the lower end of the outlet. If there are bubbles, eliminate them in time.
The method is as follows: take down the burette and tilt it at an angle of 30 º. For the acid test tube, quickly open the piston by hand (repeatedly for many times) to flush out the solution and take away the bubbles; Add the operating solution to the buret after removing bubbles above the zero scale, and then adjust it to the position of the zero scale mark.