Classification, packaging and method of chemical reagents

1,
reagentsaccording to the purity of
chemical reagents
, according to the amount of impurities, the domestic chemical reagents are divided into four levels:
first-level reagents (excellent pure reagents) are usually expressed in G.R.
secondary reagents (analytical pure reagents) are usually represented by A.R.
grade III reagents (chemical purity) are usually expressed in C.P.
level four reagents (experimental or industrial) are usually represented by L.R.
, there are also special purity standards for special work purposes. For
spectrum
pure, fluorescent pure, semiconductor pure and so on. Reagents of different specifications should be selected according to different experimental requirements. For example, general inorganic experiments with three or four reagents can be, analytical experiments need to take a higher purity of secondary or even first-level reagents.
II, the packaging of reagents
solid reagents are generally packed in a wide-mouthed bottle with cork, liquid reagents are contained in a fine mouth bottle (or drop bottle), see light easy to break down reagents (such as silver nitrate) should be packed in brown bottles, each reagent is labeled to indicate the name, concentration, purity of the reagent. (When the laboratory is divided, the solid only indicates the name of the reagent, and the liquid must also indicate the concentration).
, the use of reagentsSolid powder reagents can be obtained with a clean horn spoon. To take a certain amount of solids, you can put solids on paper or surface dishes on the scale weighing. To weigh accurately, weigh the
on
balance.
liquid reagents are commonly used in the
cylinder
volume, the capacity of the barrel is: 5mL, 10mL, 50mL, 500mL and so on, when using the amount of liquid into the drum, so that the line of sight and the lowest point of the liquid concave surface in the tube to maintain the level, and then read out the scale on the drum, that is, the volume of liquid.
a small amount of liquid reagents can be used with a dropper, take care not to touch or insert the dropper into the wall or inside the receiving container.
Take Reagent Rules
In order to achieve accurate experimental results, the following rules should be observed when using reagents to ensure that reagents are not contaminated and invarant:
1, reagents can not be in contact with the hand.
2, to use a clean spoon, tube or dropper to obtain reagents, absolutely not to use the same tool at the same time continuous access to a variety of reagents. After taking one reagent, the tool should be washed (the spoon should be dried) before another reagent is desirable.
3, reagents must be used after the bottle plug tight, can not misplace the cap and dropper, never allow Zhang Guan Li Dai, after the use of the bottle back to the original place.
4, the removed reagent can no longer be put back into the original reagent bottle.
should be used in the spirit of economy and as little as possible when using reagents, so as to facilitate operation and careful observation of the phenomenon, but also to obtain better experimental results.