Best answer: How do you dilute 90% isopropyl alcohol to 70%?

Measure out one cup of 91 per cent rubbing alcohol, and pour it into the plastic container. Add one-third of a cup of water and stir to mix the solution. The solution is now 70 per cent rubbing alcohol. Repeat this procedure as often as needed to obtain the desired amount of 70 per cent rubbing alcohol.

Can you dilute 90 alcohol to make it 70?

1/5 of 15 ounces is 3 ounces. Thus, 3 ounces of water added to 15 ounces of 90% rubbing alcohol will create a solution of 70% rubbing alcohol.
BuMath Explorations122 подписчикаПодписатьсяDiluting 91% Alcohol to 70% and More

Can you dilute 90% alcohol?

While it is generally okay to use it at the 70/30 ratio, many detailers prefer to dilute it down to a 50/50 (Alcohol to Distilled Water) ratio for optimal results. …

How much water do you mix with 91 alcohol?

By using the above equation, we find that they would need to add 2.4 ounces of (distilled) water with 8 ounces of 91% IPA, inside a 10.4 ounce (V2) bottle or larger.

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Is 70 or 90 isopropyl alcohol better for disinfecting?

70 % isopropyl alcohol is by far better at killing bacteria and viruses than 90 % isopropyl alcohol. As a disinfectant, the higher the concentration of alcohol, the less effective it is at killing pathogens.

How do you dilute isopropyl alcohol to 70?


Dilute by adding 1 part water to 2 parts of this 99% Isopropyl Alcohol.

Do I need to dilute 70 isopropyl alcohol?

Yes, you want to dilute it somewhat because 99% dries too fast to kill anything. 70% isopropyl alcohol is best, but 99% is better for making hand sanitizer, just look on the WHO or CDC website for instructions.

Is 70 or 91 isopropyl alcohol better?

Why 70 Percent Alcohol Disinfects Better Than 91 Percent, According to a Microbiologist. … But according to microbiology, 70 percent alcohol is probably more effective than 91 percent for disinfecting—depending on what kind of germs you’re trying to kill.

Can you dilute isopropyl alcohol with tap water?

Therefore, you can use tap water to dilute high-concentration ethanol products.

Is 99% isopropyl alcohol safe for skin?

The only downside of 99% isopropyl alcohol is that, understandably, it needs to be used and stored properly. In this concentration, it is highly flammable, may cause dizziness if used in high quantities in an ill-ventilated area, and can be an irritant to skin and eyes. Of course, it should also never be ingested.

How do you make 70% isopropyl alcohol from 91%?

To make 70% isopropyl alcohol from new 91% alcohol, add 3 ounces of distilled water to 10 ounces of 91% isopropyl alcohol (IPA). Or, whatever amount of 91% IPA you have, add . 3 of that amount of distilled water to get to 70%.

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Can you dilute alcohol with water?

Water helps to dilute the alcohol in the body while food helps to slow down the body’s alcohol absorption.

How do you make hand sanitizer with 70% alcohol?

If you are using a 70% isopropyl alcohol you need to change the proportions to this:

  1. 7 tablespoons plus 1 teaspoon of 70% isopropryl alcohol.
  2. 2 teaspoons aloe vera gel.


How do I dilute isopropyl alcohol calculator?

To calculate the amount of water to add to dilute your alcoholic concentration, multiply the amount of spirits you have by (strong/weak) – 1. For example, if you want to dilute 5L of 80% alcohol down to 50%, you will need to add 5 – ( ( 50 x 5 ) / 80 ) = 1.875L of water is required.

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