High School

Most foam concentrates are intended to be mixed with what percent of water?

A. 0.1 to 6.0
B. 10 to 25.5
C. 40.5 to 50
D. 94 to 99.9

Answer :

Final answer:

Foam concentrates are typically mixed with 94 to 99.9 percent water, which demonstrates a high proportion of water in the foam solution used for firefighting. This relates to how mass percentages work in chemistry, similar to how a certain percentage of ingredients are present in consumer products like bleach.

Explanation:

The question relates to firefighting foams, which are mixed with water to handle fires effectively. Foam concentrates are generally intended to be mixed with a significant proportion of water to create a fire-fighting foam. While specific concentrations depend on the type of foam and the application, a common range would be 94 to 99.9 percent water, making correct answer D. This means that if you have 100 parts of the foam-water mixture, 94 to 99.9 parts would be water, while the remaining parts would be the foam concentrate.

Using an example related to concentrations, if we have a bottle of liquid bleach, and its active ingredient, sodium hypochlorite (NaOCl), is listed as being at a mass percentage concentration of 7.4%, a 100.0-g sample of this bleach would contain 7.4 g of NaOCl. This principle similarly applies to the concentration of foam in water.