Take 500ml of 95% alcohol mixed with 75% alcohol as an example. The alcohol content of 500ml of 95% alcohol is 500× 95% = 475. If there is 475 g alcohol in 75% alcohol, and its total weight is 475 ÷ 75% = 633.33 ml, then the total amount of water to be added is: 633.33-. (distilled water)
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Precautions:
1. When alcohol is used indoors, it should be sprayed on cloth cleaning tools such as towels and then gently wiped. Rinse with plenty of water after use and keep it sealed. Handkerchiefs should be put in a ventilated place to dry.
2. It is not recommended to spray sterilized clothes with medical alcohol, and it is not recommended to use it in places with open flames or places prone to static electricity. Otherwise, it will easily lead to serious fires, and may also cause heavy property losses and endanger people's lives.
It is very important to store alcohol correctly. It should be kept away from fire sources and out of reach of children, not in the car.
Baidu encyclopedia -75% alcohol