![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
Effects of different concentrations of alcohol and normal saline in high school biology experiment Especially alcohol, hydrochloric acid! There are different experiments with different concentrations of alcohol, hydrochloric acid, respectively, what are the role of more detailed Good, brilliant, plus points
75% alcohol disinfection of more than 95% is generally known as anhydrous alcohol reaction with hydrochloric acid, general sterilization of the specific concentration do not know
The role of hydrochloric acid in high school biology experiment
I'm a junior in senior high school. I want to know about the various functions of hydrochloric acid in high school biology experiments, and the corresponding concentrations. Don't copy. Don't be too detailed,
① Enzyme activity under different pH: providing acidic environment
② 15% HCl and 95% alcohol: dissociation
③ In the process of observing the distribution of DNA and RNA in cells, the permeability of cell membrane is changed, the chromatin enters cells quickly, and the DNA and protein in chromatin are separated, which is beneficial to the combination of DNA and chromatin
Why not disinfect with 95% alcohol?
Disease analysis: the main function of alcohol disinfection is to cause the bacterial protein to coagulate and cause the bacterial death. Suggestion: 75% alcohol is the most suitable. If 95% alcohol concentration is too high, the protein will coagulate rapidly and form a protective film. Alcohol can no longer destroy the protein deeply, so it does not work
How to make the purity of 95% alcohol into 75% so as to play a role in disinfection
Add 26ml distilled water to every 100ml of 95% alcohol, and mix well to make about 75% alcohol
Why does 75% alcohol disinfect?
70% - 75% alcohol is used for sterilization and disinfection, including skin disinfection, medical equipment disinfection, iodine removal, etc
RELATED INFORMATIONS
- 1. Is the germicidal efficacy of alcohol 75 or 95
- 2. 500ml 95% alcohol, how much water to make 75% alcohol?
- 3. How much water does 1000 grams of 90% alcohol need to be diluted to 50%?
- 4. To dilute 600 ml of 95% alcohol into 75% disinfectant alcohol, how many ml of distilled water should be added?
- 5. What is the meaning of the chemical formula of alcohol 1. Represents an alcohol molecule 2. Alcohol is a substance 3. Alcohol is composed of hydrogen, carbon and oxygen 4. It means that an alcohol molecule contains two carbon atoms, two oxygen atoms and two hydrogen atoms
- 6. Alcohol burns in the air to produce carbon dioxide and water. What are their chemical equations?
- 7. The literal expression of red phosphorus sulfate and iron wire burning in oxygen
- 8. The following substances burn in oxygen, and Mars radiates all around to form black solid () A. Iron wire B. red phosphorus C. alcohol D. charcoal
- 9. Seek the chemical equation of alcohol ignition to produce carbon dioxide and water!
- 10. The literal expression of the reaction between carbon and oxygen For example, the literal expression of ammonium bicarbonate heating Ammonium bicarbonate heating ammonia + water + carbon dioxide In this form, We need literal expressions, not symbolic expressions. I can't understand some symbols What's the matter with the insufficient combustion charge? Does it affect expression
- 11. Dosage and usage of hydrochloric acid and alcohol in high school biology experiment The name of the experiment should be specified For example, 8% hydrochloric acid is used to observe the distribution of DNA and RNA, and change the permeability of cell membrane Ask for specific and complete answers
- 12. What's the effect of alcohol? Which experiment
- 13. In senior high school biology experiment, alcohol and hydrochloric acid play an important role in the whole process,
- 14. Put the leaves of plants in alcohol to heat. What is the function of alcohol? Photosynthesis experiment Understand the answer I did not give, not to
- 15. What's the difference between the effect of alcohol in the test of fat in biological tissue and the observation of mitosis in plant cells~
- 16. The following is about the application of alcohol in biological experiments A. In the experiment of using Sudan III to identify fat, the role of alcohol is to wash off the floating color on the experimental materials. B. absolute alcohol plays the role of separating pigment in the experiment of pigment extraction and separation. C. when making onion root tip cell mitotic chip, the components of dissociation solution are hydrochloric acid and alcohol D In the experiment of observing the distribution of DNA and RNA in cells, alcohol can be used to change the permeability of cell membrane and accelerate the dye entering into cells
- 17. The purpose of each concentration of alcohol,
- 18. High school biological reagents, such as alcohol, say different concentrations in their respective experiments, 3Q ~!
- 19. How to make 75% ethanol from 95% ethanol
- 20. Now there is 98% ethanol, how to prepare 75% ethanol