For example, take 100mL95 alcohol, 95/0.75 = 126.67, need to add 26.67mL of water, it becomes 75 degrees alcohol. Alcohol dilution is the process of preparing high-concentration (95%) alcohol (500ml packaged, 95% alcohol), adding a certain volume of water, and making it into low-concentration (eg 75%) alcohol.

Method of operation

1. The concentration value of 95% alcohol is expressed in volume fraction (%). That is, 100 ml of solution contains 95 ml of alcohol.

2. Alcohol dilution is the process of preparing high-concentration (95%) alcohol (500ml package, 95% alcohol), adding a certain volume of water, and making it into low-concentration (for example, 75%) alcohol.

3. For example, to prepare 100 ml of 75% alcohol: calculation formula: find the volume of 95% alcohol V=(75%×100ml)/95%=78.9ml.

4. Dilution operation: Add 78.9ml to a 100ml dry and clean measuring cylinder. 95% alcohol, diluted with distilled water to the mark of 100 ml, then transferred to the reagent bottle, and labeled.

75% alcohol could make disinfectant ,it will protect our body.