Isopropyl alcohol C1 = 100%, V1 = ? , C2 =70%, V2= 2.5 L

Question

Solve the following problems and determine the amount of diluent.

Answer 1

Hello Alysha

To answer this question, you need to use the dilution equation, which is

C1 V1 = C2 V2

Rearrange to solve for V1

V1 = C2 V2 / C1

= 70% x 2.5 L / 100%

= 1.75 L round up to 1.8 L to the correct # of significant figures, which is 2.

Take 1.8 L of the 100% solution and add 0.7 L of water to make 2.5 L of the 70% solution.