Question 1007 of 229 · California Water Distribution Operator Exam
Approximately what percentage of available chlorine does calcium hypochlorite (HTH) contain?
Exactly one answer is correct.
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Correct answer to question 1007
- A: 65 to 70 percent
Explanation
Dry calcium hypochlorite is about 65 to 70 percent available chlorine, so the chemical weight must be corrected for purity. Liquid sodium hypochlorite is only about 12 percent, and chlorine gas is 100 percent.
More questions: Disinfection
- 1008Which form of chlorine is 100 percent available chlorine?
- 1009A chlorine dose of 3.0 mg/L produces a free chlorine residual of 0.8 mg/L after the contact time. What is the chlorine demand?
- 1010Which substances commonly create chlorine demand in a distribution system?
- 1011The total chlorine residual equals which combination?
- 1012Which test is most often used by operators in the field to measure chlorine residual?
- 1013A sudden drop of chlorine residual at a dead-end hydrant most likely points to what?