If you're trying to dilute a liquid, you would need 30% of the volume in water to mix. When using liquid reagents, the percent concentration is based upon volume per volume, i.e. #ml/100ml.
For example, if you wanted to make a 70% ethanol solution, 70 ml of 100% ethanol would be dissolved in 30 ml of water.
|11/09/2018, 1:59 PM||from 100 % I wanna get 70%|
|11/09/2018, 3:46 PM||Re: from 100 % I wanna get 70%|