How to open a volatile reagent bottle in summer? How does the solution stored in a glass bottle change for a long time? The solution will contain sodium, calcium, silicate impurities or some ions in the solution will be adsorbed on the glass surface to reduce the concentration of the ions in the solution. How

Volumetric flasks are primarily used to accurately formulate solutions of a certain concentration. It is a slender neck, pear-shaped flat-bottomed glass bottle with a ground plug. The bottleneck is engraved with a marking. When the liquid in the bottle reaches the marking line at the specified temperature, its volume is the number of volumes indicated

First, the role A burette is a gauge that accurately measures the volume of a standard solution during a titration operation. There are tick marks and values ​​on the wall of the burette. The minimum scale is 0.1 ml. The “0” scale is on the top, and the values ​​from top to bottom are from

1. What conditions should be used as a benchmark? Answer: (1) High purity, above 99.9% (2) Composition and chemical formula are completely consistent (3) Good stability, not easy to absorb water, not easily oxidized by air, etc. (4) Molar mass is large, weighing is large, and the weighing error can be reduced. 2. What are

Volumetric flask leak test method? A: Before use, check whether the volume bottle stopper is tight， please put tap water into the bottle near the marking line, cover the stopper, hold the stopper by hand, invert the volume bottle, and observe whether there is water in the bottle mouth. If it does not leak, after

The titration should be made by inserting the tip of the Laboratory Burette into the cone of the cone (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. Flow down and shake the conical flask while dripping. Rotate circumferentially in

1. Access to medicines: “Three inaccuracies” Note: The original reagent bottle can not be returned to the laboratory after it has been taken out or used. A: Access to solid medicines Use a tweezers for block solids (specific operation: first place the container horizontally, put the medicine into the mouth of the container, and then

1.Test tubes are commonly used: 2.The beaker is mainly used for: 3. Flask (round bottom flask, flat bottom flask): 4. Erlenmeyer bottles are commonly used for: 5.Evaporating dishes are usually used for concentration or evaporation of solutions. 6.The plastic dropper is used to remove and add a small amount of liquid. Note: 7.A measuring cylinder

1. How to wash pipettes and suction tubes? Both the pipette and the suction tube can be washed with tap water, then rinse with distilled oil, when it is dirty (when the inner wall is hanging with water drops), it can be washed with chromic acid washing solution. 2. What is the method of washing

1、What is the method of oiling an acid burette? Remove the piston, use a clean paper or cloth to dry the inner wall of the piston and the sleeve. Use our fingers to apply a small amount of Vaseline to apply a thin circle on both ends of the piston. Do not apply Vaseline on both