Dilute a stock of 95 ethanol to make 250 ml of 35 ethanol Pl

Dilute a stock of 95% ethanol to make 250 ml of 35% ethanol

Please show all work!

Solution

Answer:

Stock of ethanol = 95%

Required stock = 35%

Volume = 250 mL

C1V1= C2V2

(stock)   (required)

V1=C2V2/C1

V1 = (35% X 250 mL )/ 95%

=92 mL

92 mL of stock + 158 mL uL of H2O gives 250 mL of 35% ethanol