Question

Rachel juiced 10 times the amount of bleach required for making a sanitizing solution. This is considered a ___?

1) Mistake
2) Dilution
3) Efficiency
4) Excess

Answer 1

Rachel juiced 10 times the amount of bleach required for making a sanitizing solution, which is an excess. This over-concentration can make the solution dangerous or unusable. Correct calculations are vital to achieving the right dilution for safety and effectiveness.

Step-by-step explanation:

If Rachel juiced 10 times the amount of bleach required for making a sanitizing solution, this is considered an excess. This is because the correct amount of bleach has been exceeded by a factor of 10. In a typical dilution scenario, a highly concentrated solution, such as stock bleach solution, is diluted to achieve a desired lower concentration. The label of liquid bleach often specifies the concentration of its active ingredient, sodium hypochlorite (NaOCl), by mass percentage.

For example, if a bleach bottle label states that it contains 7.4% NaOCl by mass, then a 100.0-g sample of this bleach would contain 7.4 g of NaOCl. When preparing solutions, it's important to correctly calculate the amount of the concentrated stock solution needed to make the desired solution concentration. Adding too much of the stock solution, like Rachel did in this case, results in excess concentration, potentially making the solution dangerous or unusable for its intended purpose.