Answer:
2.8L
Explanation:
Using the dilution formular
C1 V1= C2V2
Where
C1= concentration of the stock solution= 4.0M
V1= volume of stock solution required= ???
C2= concentration to be prepared= 2.5M
V2= volume of prepared solution required= 4.5L
4.0× V1= 2.5×4.5
V1= 2.5 ×4.5/4.0
V1= 2.8L
