Welcome To Huida

Use of lab volumetric flask

[lab volumetric flask,glass volumetric flask,500 ml volumetric flask,volumetric flask 100 ml,volumetric flask class b]

Before use, check whether there is water leakage at the stopper (newly purchased, check after cleaning). Place the accurately weighed solid solute in a beaker and dissolve it with a small amount of solvent. When the liquid level added to the volumetric flask is about 0.5-1 cm away from the marking line, it should be carefully dripped with a dropper, and finally the meniscus of the liquid is exactly tangent to the marking line. Tightly cap the bottle, and use the method of inverting and shaking to mix the liquid in the bottle evenly. Open the lid and reflux.
The volumetric flask is a thin-necked pear-shaped flat-bottomed volumetric device with a ground glass stopper and a marking on the neck. It means that when the meniscus of the liquid is tangent to the marking line of the bottleneck of the volume at the indicated temperature, the volume of the solution is exactly equal to the volume marked on the bottle. The volumetric flask is marked with: temperature, capacity, scale line.

The volumetric flask is a precise instrument used to prepare a solution with an accurate amount and concentration of a certain substance. It is a thin, pear-shaped, flat-bottomed glass bottle with a ground glass stopper, with graduations on the neck. When the volume in the bottle reaches the mark at the specified temperature, its volume is the indicated volume. This kind of volumetric flask is generally “measured in”. But there are also two markings, the upper one indicates the measured volume. Often used in conjunction with pipettes. The volumetric flask has many specifications, the small ones are 5ml, 25ml, 50ml, 100ml, and the large ones are 250ml, 500ml, 1000ml, 2000ml, etc. It is mainly used for preparing standard solutions and accurately diluting solutions by direct method and preparing sample solutions. Volumetric flasks are also called measuring flasks. Accurately weigh the washed, dried, and stoppered volumetric flask (weight of the empty bottle). Pour distilled water to the marking line, record the water temperature, absorb the water droplets on the inner wall of the bottle neck with a filter paper strip, cover the bottle stopper, and weigh. The difference between the two weighings is the quality of the water contained in the volumetric flask. Calculate the true volume value of the volumetric flask at 20°C according to the above method, and obtain the correction value.