To neutralize chlorine in 10,000 gallons of water, how much sodium thiosulfate is required to affect a change of 10 ppm?

To neutralize chlorine effectively in a body of water, knowing the proper quantity of sodium thiosulfate to use is crucial for maintaining water quality and safety. Sodium thiosulfate is commonly used as a dechlorinating agent because it reacts with chlorine to neutralize it.

In this situation, you're dealing with a volume of 10,000 gallons of water and intend to achieve a reduction of chlorine concentration by 10 parts per million (ppm). To calculate the required amount of sodium thiosulfate, one must consider the stoichiometry of the reaction and the specific characteristics of the compound, including its effectiveness in counteracting chlorine.

For water treatment, a general rule of thumb indicates that approximately 0.1 ounces of sodium thiosulfate is needed to neutralize 1 ppm of chlorine in 1 gallon of water. Given this standard rate, for 10,000 gallons and a desired change of 10 ppm, the calculation would look like this:

0.1 ounces × 10 ppm × 10,000 gallons = 10 ounces

This calculation clarifies that utilizing 10 ounces of sodium thiosulfate will successfully neutralize the intended amount of chlorine in the specified volume of water, making it