Question

The technician is asked to make 8 oz of a 50% solution of Isopropyl Alcohol (IPA). ingredients available: Isopropyl Alcohol 70% and water. How many milliliters of water are needed?

Answer 1

118.296 ml of water

Step-by-step explanation:

Given that;

v/v% concentration = volume of solute/volume of solution * 100

volume of solution = 8 oz

v/v% concentration = 50%

50 = volume of solute/8 * 100

volume of solute = 50 * 8/100

volume of solute = 4 oz

Volume of water needed = Volume of solution - volume of solute

Hence

8 oz - 4 oz

Volume of water needed = 4 oz

1 oz = 29.574 ml

4oz = 4oz * 29.574 ml/1 oz

= 118.296 ml of water