Chemisty  urgent
posted by annie on .
How do I prepare 30% v/v ethanol from 95% ethanol?
Thanks.

Would 100 mL of 95% EtOH diluted to 316.6 mL (assuming volumes are additive) do it?

Hi, how do I do the calculation?
Thanks 
95/x = 30
x = 3.167
1 mL to 3.167 mL or
10 mL to 31.67 mL or
100 mL to 316.7 mL or
1000 mL to 3167 mL.
95% x (100/3.167) = 30%