Steps to use Burette Stopcock

Check whether there is leakage, must be washed, rinsed, the bubbles in the tube must be exhausted, the reading needs to be twice, the line of sight, scale, the lowest point of the concave surface of the liquid level is on the same horizontal line, while observing the experimental changes, while controlling the dosage.

1, basic burette is also known as stopper burette, it has a rubber tube below, there is a glass marbles in the middle, used to manipulate the water flow of aqueous solution, it is used to fill alkaline solution and non-reducing aqueous solution, all aqueous solutions that can be effective with rubber tubes can not be loaded into the basic burette, such as KMnO4, K2Cr2O7, iodine solution, etc.

2. The burette flow rate control is difficult, relying on the bottom valve to control the flow rate, opening small drops too slow or even not drip, opening large drops too fast or even dripping over the end. Reading is difficult, it is necessary to read the line of sight and the liquid surface on the same level, if it is not horizontal, it will produce errors.

3. The rubber head dropper is actually very simple to use, but for people who are new to contact, it is still more complicated. The rubber head dropper consists of a rubber cap and a glass tube. There are several forms such as straight, straight with buffer ball and curved with buffer ball. The specifications of the rubber tip dropper are expressed in the tube length, and are commonly used in 2 types: 90 mm and 100 mm.