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Because 70% is a strong enough concentration to lead to the disintegration of the outer bacterial plasma membranes, eventually denaturing proteins and killing off bacteria. We do not tend to use 100% ethanol (one would think it to be more effective) since this could kill off the bacteria, however it may preserve the genetic material of the bacterium, which may be transferred to other bacterial cells. This is to be avoided when culturing cells, for example.
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Why use the 70 percent ethanol?
to save the ethanol
Is the percent of ocean on earth 70 percent or 75 percent?
70%
What is the percent of 49 out of 70?
49/70 x 100 = 70 percent.
What is 70 percent of all fresh water used for?
To irrigate crops
What is 2 percent of 70?
2 percent of 70 =1.42% of 70= 2% * 70= 0.02 * 70= 1.4
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
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 is 70 percent ethanol used in rna extraction?
The density of 70% ethanol allows RNA settlement or say sedimentation in the vial.
Why use the 70 percent ethanol?
to save the ethanol
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 70 percenet is used instead of 100 percent as disinfectant?
Disinfectants are usually mostly alcohol, Ethanol to be exact. Ethanol can only reach a purity degree of 95-96 percent in liquid form, with purer solutions existing only as a gas. 70 percent alcohol is sufficient to kill the bacteria, and a higher purity would not have any beneficial effect.
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 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.
