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Basic treatment of chemical reagents
2017/3/20
Chemical reagents are important substances for chemical research and component analysis. They are an important condition for scientific and technological progress. They are widely used in the composition, separation, qualitative and quantitative analysis of substances. They can be said to be chemists' eyes, factories, schools, The work of the Institute, are inseparable from the chemical reagents. Because many chemical reagents are toxic, acidic or corrosive, therefore, in the treatment of these chemical reagents, we must pay attention to safety, it is necessary to strictly follow the relevant operating techniques to do, do not careless. So, what is the fundamental way to deal with chemical reagents? Then follow the Shanghai Yan domain Xiaobian together to see it:
The basic treatment of chemical reagents are the following:
1. Liquid drugs: a small number of liquid with plastic head dropper, drip mouth and container mouth can not touch. A lot of liquid can be dumped, should be hand labels. Do not specifically explain the amount, take 1 ~ 2mL. Quantitative with a pipette to measure or use the amount of cylinder.
2. Solid medicine: powdery solid or small notes directly into the bottom of the instrument. The bulk solids slowly slide from the mouth of the container to the bottom with tweezers. Do not specifically explain the amount, take 1 ~ 2g, quantitative weighing with a balance.
3. Dissolution, mixing, vibration: in order to dissolve need to be mixed or vibration or mechanical mixing, can also be heated.
(1) the dissolution of solid material: chunks first in the mortar in the grinding, and then transferred to the container to add solvent to mix and dissolve.
(2) the liquid dissolved: during which concentrated sulfuric acid should be diverted into the water, while edge edge mixing and so on.
(3) the dissolution of gas: should be due to gas solubility is not the same as underwater dissolved or water soluble.
4. Heating: heating, the heating material should be placed in the bottom of the bottom of the alcohol lamp outside the flame some. We should pay attention to the choice of liquid and solid matter heating method, grasp method. In addition to conventional heating, there are even heating, water bath (within 100 degrees), oil bath (100 ~ 250 degrees), sand bath (to 350 degrees) heating.
5. Use of test paper: measuring the acidity of the solution: with a clean glass rod dipped in the solution to be tested drops in the test paper (or take a few to be measured, the pH test paper immersed in the immediate removal) immediately and standard color card comparison The (Do not allow the pH test paper immersed in a lot of the test solution, but do not agree to put the pH test paper into a lot of liquid to be measured, otherwise it will not know the pollution of the liquid).
6. Solution manufacturing:
(1) the amount of material concentration solution manufacturing process: a calculation, two said (volume), three dissolved, four wash, five move, six vibration, seven, eight shake, nine loaded, ten paste.
(2) Percent concentration of the solution of the solution: First, accounting; Second, weighing; Third, dissolved.
The basic treatment of chemical reagents are the following:
1. Liquid drugs: a small number of liquid with plastic head dropper, drip mouth and container mouth can not touch. A lot of liquid can be dumped, should be hand labels. Do not specifically explain the amount, take 1 ~ 2mL. Quantitative with a pipette to measure or use the amount of cylinder.
2. Solid medicine: powdery solid or small notes directly into the bottom of the instrument. The bulk solids slowly slide from the mouth of the container to the bottom with tweezers. Do not specifically explain the amount, take 1 ~ 2g, quantitative weighing with a balance.
3. Dissolution, mixing, vibration: in order to dissolve need to be mixed or vibration or mechanical mixing, can also be heated.
(1) the dissolution of solid material: chunks first in the mortar in the grinding, and then transferred to the container to add solvent to mix and dissolve.
(2) the liquid dissolved: during which concentrated sulfuric acid should be diverted into the water, while edge edge mixing and so on.
(3) the dissolution of gas: should be due to gas solubility is not the same as underwater dissolved or water soluble.
4. Heating: heating, the heating material should be placed in the bottom of the bottom of the alcohol lamp outside the flame some. We should pay attention to the choice of liquid and solid matter heating method, grasp method. In addition to conventional heating, there are even heating, water bath (within 100 degrees), oil bath (100 ~ 250 degrees), sand bath (to 350 degrees) heating.
5. Use of test paper: measuring the acidity of the solution: with a clean glass rod dipped in the solution to be tested drops in the test paper (or take a few to be measured, the pH test paper immersed in the immediate removal) immediately and standard color card comparison The (Do not allow the pH test paper immersed in a lot of the test solution, but do not agree to put the pH test paper into a lot of liquid to be measured, otherwise it will not know the pollution of the liquid).
6. Solution manufacturing:
(1) the amount of material concentration solution manufacturing process: a calculation, two said (volume), three dissolved, four wash, five move, six vibration, seven, eight shake, nine loaded, ten paste.
(2) Percent concentration of the solution of the solution: First, accounting; Second, weighing; Third, dissolved.
