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The ethanol part of the mixture will boil at 78.4C, the rest of the substances will boil at their respective boiling points.
This property provides the basis for fractional distillation, a method that can be used to refine crude oil into different types of products by heating the mixture to progressively higher boiling temperatures, then collecting and condensing vapor.
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Why 70 ethanol is used as disinfectant?
a) 70% ethanol has been found to b most effective in killing microbes.Higher or lower concentrations may not b as effective. b) if u use 90% or absolute ethanol, it will evaporate fast and may not be much effective. c) using higher concentrations will leave its traces on the applied surfaces d) higher concentrations of ethanol are harmful to skin and makes it dry pretty a) 70% ethanol is most effective.higher or lower ones r not as effective b) it evaporates at a slow rate than 90% or absolute ethanol. therefore it is more effective and saves ur ethanol too.. c) higher concentrations alwez leave traces applied surfaces thus addind an unwanted reagent d) 70% ethanol is comparatively less harmful to ur hands.. higher concentrations makes ur skin dry..
What gases can exist at 70 degrees Fahrenheit?
70 oF = 21 oC This is a comfortable room temperature so many substances are gases at this temperature. Any substance that has a boiling point lower than 70 oF / 21 oC
Water cover of the earths surface 20 percent 30 percent 50 percent 70 percent?
70
What planet is made of 70 percent water and 30 percent land?
its earth
70 percent of earths freshwater?
Is frozen in the poles
Is 70 percent ethanol the same with 70 percent ethanol?
Absolutely, recent painstaking scientific research has showed that 70% ethanol is the same as 70% ethanol.
Why use the 70 percent ethanol?
to save the ethanol
How many moles of ethanol in vapor at 70 degrees Fahrenheit?
Ethanol has a heat of vaporization of 38.56 kj/mol and a normal boiling point of 78.4 degrees celsius.
Why 70 percent ethanol is used for sterilization instead of 100 percent?
70% ethanol has been shown to have the highest killing ability of microbes. Also, 100% ethanol is toxic to the user
What is the total volume of 70 percent ethanol from 1600ml ethanol?
If I understand you correctly, we are trying to find the volume of 70% of 1600 ml of ethanol. That said: here is how you do it:1. Change 70% into a decimal. You do this by moving the decimal point two places to the right. This would turn 70 into .702. Multiply .70 x 1600.3. The answer is: 1120mL.
Why is 70 percent ethanol used in rna extraction?
The density of 70% ethanol allows RNA settlement or say sedimentation in the vial.
Why 70 percent percent ethanol used in labs?
70% is the most effective concentration to denature poteins so killing bacteria. At 95% the ethanol just evaporates and leaves the protein untouched. Below 70% does not denature proteins. It also makes the ethanol less flammable.
How does one prepare 500ml of 70 percent ethanol?
150 ml ethanol to 350 ml distilled water
How do you dilute from ethanol 96 percent to 70 percent?
There's a dilutionfactor of 70/96=0.729, when you make 1 liter, you have to use 729 milliliters of ethanol, then you to add water till 1 liter total.
Why you use 70 percent ethanol in laminar air flow chamber?
we can also use 100% ethanol or pure ethanol but as it has been tested that 70% is sufficient to kill all the cells and spores of microbes so use this
Why is 70 percent ethanol or any diluted alcohol for that matter better at penetrating cell membranes than undiluted alcohols?
70 percent ethanol means it has 30 percent of water.so due to natural osmosis water can enter thr cell membrane.the ethanol thus moves inside along with water and hence has a beter penetrating power than undiluted ethanol.
Why do you use 70 percent alcohol and not 90 percent while microbial culture?
Ethanol creates pores in the cell membrane of the microbial cell by solubilizing the lipoproteins of the membrane. The activity of ethanol determines its concentration. If we 90 percent ethanol, the amount of ethanol molecules available to act upon the cell is more and it attacks the cell membrane from all sides. The dissolved lipoprotein forms a kind of layer around the cell, due to which the alcohol is unable to act further and cause damage to the cell. However, if we use 70 percent ethanol, the amount of ethanol molecules are few and it is not able to attack the cell from all sides. Thus, pores are created intermittently in the plasma membrane, the ethanol penetrates the cell and damages it completely. So, 70 percent ethanol is preferable to 90 percent when using microbial cultures.
