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So I have 1 liter of isopropyl alcohol 99.9% and I would like to make it more effective (make it 70% concentration) and at the same time make it last longer as there's a shortage off this stuff. So I came up with 2 ideas:

1) I can add 400ml of water to it so that it will be 71.4% alcohol solution.

2) I can add 1 liter of 40% vodka to it and that would be 50% isopropyl alcohol + 20% ethanol. => 70% alcohol solution.

Which one is better? Can I combine this two alcohols?

Will that make a solution with 70% alcohol or a 50% isopropyl and 20% ethanol?

Will solution 2) be an effective biocide against viruses?

Thanks!

Disclaimer: My brother asked the same question in Chemistry and I'm trying my luck here.

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    $\begingroup$ Welcome to Biology.SE! Please take the tour and then go through the help pages starting with How to Ask questions effectively on this site and edit your question accordingly. In particular note that personal medical questions are not appropriate for this site. ——— Please consult with a medical professional instead — any advice on medical subjects obtained over the internet should be regarded with extreme suspicion. Thanks! 😊 $\endgroup$ – tyersome Mar 25 at 5:18
  • $\begingroup$ Hey, thank you for your time and kind advice! $\endgroup$ – Andrei Verdes Mar 25 at 12:29