Texas Commission on Environmental Quality (TCEQ). Class C Water License Exam

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What is the typical percentage of chlorine in calcium hypochlorite (HTH)?

25%-35%
45%-55%
65%-75%
80%-90%

The correct answer is: 65%-75%

Calcium hypochlorite, commonly referred to as HTH (High Test Hypochlorite), typically contains a chlorine concentration within the range of 65% to 75%. This high concentration makes it one of the most powerful and effective forms of chlorine used for disinfection purposes, particularly in water treatment facilities. The reason this percentage range is significant is that it ensures that a sufficient amount of chlorine is available for oxidation and disinfection processes, allowing for effective removal of pathogens and maintaining water quality. Chlorine from calcium hypochlorite is widely utilized because, aside from its high chlorine content, it also has the added benefit of being stable for long periods when stored properly, making it a preferred choice in water treatment applications. The options that reflect lower percentages do not accurately represent the composition of HTH, which is designed to provide a strong and effective means of disinfection. Therefore, while other options may suggest lower chlorine concentrations, they do not align with the typical chemical makeup of calcium hypochlorite.