Formaldehyde: formaldehyde or phenylacetone.
How to say formaldehyde content detection in English?
Formaldehyde content test _
Translation results:
Formaldehyde content test
What is the English letter of formaldehyde?
formaldehyde
Formaldehyde, chemical formula HCHO, molecular formula 30.03, also known as formaldehyde. Colorless gas, with a special odor, has a * * * effect on people's eyes and nose. The relative density of gas is 1.067 (air = 1), and the density of liquid is 0.8 15g/cm? (-20℃)。 Melting point -92℃, boiling point-65438 09.5℃. Soluble in water and ethanol. The highest concentration of aqueous solution can reach 55%, usually 40%. It is called formaldehyde water, commonly known as formalin, and it is a colorless liquid with an odor of * * * *.
Strong reduction, especially in alkaline solution. Can burn, steam and air form an explosive mixture, and the explosion limit is 7%-73% (volume). The ignition temperature is about 300℃.
Formaldehyde can be produced by dehydrogenation or oxidation of methanol under the catalysis of metals such as silver and copper, and can also be separated from hydrocarbon oxidation products. Used as pesticides and disinfectants, raw materials for preparing phenolic resin, urea-formaldehyde resin, vinylon, urotropine, pentaerythritol and dyes.
Industrial formaldehyde solution generally contains 37% formaldehyde and 15% polymerization inhibitor methanol, and its boiling point is 10 1℃.
How much is the formaldehyde detector?
How much is the formaldehyde detection instrument? -How much is the formaldehyde detector?
Is there formaldehyde in Oxford cloth storage box?
Is there formaldehyde in Oxford cloth storage box?
English translation/ translator/ interpreter
Is there formaldehyde in the Oxford container?
Kneel and beg for 5 points for an English paper on formaldehyde
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English experimental report on formaldehyde determination experiment
First, the experimental purpose
Master the determination method of a class of chemical reagents, and be familiar with the correct configuration and operation process of some reagents.
Second, the experimental principle
Formaldehyde reacts with excess neutral sodium sulfite to generate sodium hydroxide, which is titrated with sulfuric acid standard titration solution with thymolphthalein as indicator.
Formaldehyde+sodium sulfate+H2O = H2C(OH)SO3Na+NaOH
2NaOH + H2SO4 = Na2SO4 + 2H2O
Three. Reagents and solutions
Sodium sulfite, sodium carbonate, sulfuric acid standard solution, methyl red indicator, thymolphthalein indicator.
Fourth, the experimental steps
1. Preparation of sulfuric acid standard solution: Take 15ml concentrated sulfuric acid and pour it slowly along the wall.
In a beaker containing 500 ml of distilled water.
2. Calibration of sulfuric acid standard solution: weigh 1.6g sodium carbonate in 250ml.
Dissolve 80ml distilled water in the conical flask, drop 3 drops of methyl red indicator, and titrate with sulfuric acid standard solution until the solution changes from light yellow to purple. (Do two parallel tests to average)
3. Determination of formaldehyde content: Weigh about 6.3g of sodium sulfite into a 250ml conical flask.
Add 50 ml distilled water to the bottle to dissolve and drop 3 drops of thymolphthalein indicator, and neutralize with sulfuric acid standard titration solution until the blue color just disappears. Weight 1.3 ~
Is professional in addition to formaldehyde useful?
Is professional in addition to formaldehyde useful?
Is professional in addition to formaldehyde useful?
What should I do if the office formaldehyde exceeds the standard?
Don't be afraid of excessive formaldehyde. The so-called profession has specialization. If the formaldehyde exceeds the standard, you must find a professional management company, recommend Xi 'an Anxin air environmental protection, and check in seven days after treatment.
How to read formaldehyde?
Jiaquan