How to make 75% ethanol from 95% ethanol
According to the fact that the mass of ethanol in the preparation process is fixed, that is to say (volume fraction * volume) is fixed. If 95% ethanol is 1L, then 75% ethanol is (95% * 1L) / 75%
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- 1. High school biological reagents, such as alcohol, say different concentrations in their respective experiments, 3Q ~!
- 2. The purpose of each concentration of alcohol,
- 3. 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
- 4. 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~
- 5. 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
- 6. In senior high school biology experiment, alcohol and hydrochloric acid play an important role in the whole process,
- 7. What's the effect of alcohol? Which experiment
- 8. 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
- 9. 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
- 10. Is the germicidal efficacy of alcohol 75 or 95
- 11. Now there is 98% ethanol, how to prepare 75% ethanol
- 12. Who knows how 75% alcohol becomes anhydrous ethanol? Why?
- 13. How to prepare 75% ethanol? I don't know if 75% is volume fraction or mass fraction
- 14. From the inside, the cuboid box with the edge length () has a volume of 1 cubic decimeter, which can hold( Measured from the inside, the cube box with edge length () has a volume of 1 cubic decimeter, which can hold () water
- 15. How many cubes can be placed in a box with a volume of 1 cubic meter
- 16. A drink bottle can hold up to 1.25 kg of water, then the volume of the bottle is () cubic decimeter
- 17. The volume of a 20 liter tank A. is equal to 20 cubic decimeters B. larger than 20 cubic decimeters C. smaller than 20 cubic decimeters
- 18. The volume of a conical container is 9.42 cubic decimeter, and the bottom radius is 1 decimeter
- 19. A cylindrical container with a volume of 3 cubic decimeters is placed on a horizontal table. The container contains 1 kg of water. Now, a container with a density of 0.6 g per cubic meter A cylindrical container with a volume of 3 cubic decimeters is placed on a horizontal table. The container contains 1 kg of water. Now put a wood block with a density of 0.6 g / cm3 into the container. The wood block does not touch the wall of the container. The water is just full but does not overflow. What is the mass of the wood block?
- 20. A container with a volume of 20 cubic decimeters and a mass of 4 kg is used to calculate the total mass when it is filled with water As the title