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.
