If 5 oz of concentrate is mixed to create 1 gallon of dilution, how much concentrate is needed for a ½ gallon of dilution?

To determine how much concentrate is needed for a ½ gallon of dilution, it's essential to first understand the dilution ratio established in the original instruction, which indicates that 5 oz of concentrate is required to create 1 gallon of solution.

Since 1 gallon is double the volume of ½ gallon, the required amount of concentrate for ½ gallon can be calculated by halving the amount used for a full gallon.

Thus, you would take the 5 oz of concentrate and divide it by 2 to find the quantity required for ½ gallon:

5 oz ÷ 2 = 2.5 oz.

Therefore, 2.5 oz of concentrate is necessary to create a ½ gallon of diluted solution, making this the correct answer. This precise calculation is based on maintaining the same mix ratio, ensuring that the properties of the solution remain consistent regardless of the volume being prepared.