calculate how to make 10 mL of 15:85 ethyl acetate:hexane solution
from 2 mL of 5:95 ethyl acetate:hexane, using pure hexane and pure ethyl
acetate.
To calculate how to make a 10 mL solution of 15:85 ethyl acetate:hexane, you will need to determine the amount of ethyl acetate, hexane, and any additional solvent needed. Here's how you can calculate it step by step:
1. Calculate the amount of ethyl acetate needed:
a. Multiply 10 mL (target volume) by 0.15 (15% in decimal form) to determine the volume of ethyl acetate required.
10 mL x 0.15 = 1.5 mL
b. Since you already have 2 mL of a 5:95 ethyl acetate:hexane solution, subtract 1.5 mL from it to determine the additional volume of ethyl acetate needed.
2 mL - 1.5 mL = 0.5 mL
2. Determine the amount of hexane needed:
a. Subtract the volume of ethyl acetate needed (1.5 mL) from the total target volume (10 mL) to find the volume of hexane required.
10 mL - 1.5 mL = 8.5 mL
3. Calculate the additional volume of pure solvent needed:
a. Subtract the volume of hexane you already have (from the 2 mL solution) from the volume of hexane needed.
8.5 mL - 0 mL (already have 0 mL) = 8.5 mL
Therefore, to make a 10 mL solution of 15:85 ethyl acetate:hexane, you will need to mix 0.5 mL of ethyl acetate, 8.5 mL of hexane, and an additional 8.5 mL of pure hexane.