Question

A technician is asked to make 8 oz. of a 50% solution of Isopropyl Alcohol (IPA). Calculate the amount of 70% IPA and water you would need?

a) 3.2 oz of 70% IPA and 4.8 oz of water
b) 4 oz of 70% IPA and 4 oz of water
c) 5.6 oz of 70% IPA and 2.4 oz of water
d) 6 oz of 70% IPA and 2 oz of water

Answer 1

To make 8 oz. of a 50% solution of Isopropyl Alcohol (IPA), you would need 3.2 oz of 70% IPA and 4.8 oz of water.

Step-by-step explanation:

To calculate the amount of 70% IPA and water needed to make 8 oz. of a 50% solution of Isopropyl Alcohol (IPA), we need to use the formula:

(% solution A)(volume of solution A) + (% solution B)(volume of solution B) = (% desired solution)(total volume of solution)

Let x be the volume of the 70% IPA and y be the volume of water. We can set up two equations:

1. 0.70x + 0y = 0.50(8 oz)
2. x + y = 8 oz

Solving these equations gives us x = 3.2 oz and y = 4.8 oz. Therefore, the correct answer is a) 3.2 oz of 70% IPA and 4.8 oz of water.