[Helpneeded2020]

Hi, got some isopropyl based hand sanitizer 63%. Would like to add 99% isopropyl to obtain final concentration of 75-85%. What is the formula or percentage of each? Thank you and stay clean.

[chenbeier]

Do you know the cross rule?

[Helpneeded2020]

No, sorry. Bad at chemistry, hence the post here. Thank you.

[chenbeier]

Here it is not allowed to give final solutions.
Write Left Side the wochentags what you have in the middle what you want to have , make the differences then you get the weight parts.


https://primerdigital.com/tools/UniDilution.html

[Helpneeded2020]

Thanks for the tips. I think I got it solved. Mixture calculator.

https://www.distilling-spirits.com/tools/calculations/mixing-alcohol/?alc_c_low=63&alc_c_high=99&alc_c_soll=81&alc_v_low=&alc_v_soll=1#result

50 ml of 63% + 50 ml of 99% = 100 ml of 81%

Not 100% sure, but the math looks about right

Use at your own risk. Too much lawsuits nowdays.

[billnotgatez]

@Helpneeded2020

...
Not 100% sure, but the math looks about right
...

I am skeptical that you actually did the math to prove the calculator as correct.