Question 1020 of 229 · California Water Distribution Operator Exam
Which form of free chlorine is the stronger disinfectant?
Exactly one answer is correct.
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Correct answer to question 1020
- D: Hypochlorous acid (HOCl)
Explanation
HOCl is a neutral molecule that penetrates cell walls easily and is roughly 80 times more effective than the hypochlorite ion. Chloride has no disinfection power.
More questions: Disinfection
- 1021What chlorine to ammonia-nitrogen ratio, by weight, is typically targeted when making chloramines?
- 1022Which is an advantage of using chloramines instead of free chlorine in a distribution system?
- 1023Which problem is specific to chloraminated distribution systems?
- 1024Water that will be used for kidney dialysis or fish tanks needs special treatment when the system uses chloramines. Why?
- 1025On the chlorine dose curve, what is the breakpoint?
- 1026In a breakpoint chlorination curve, what makes up the residual after the breakpoint is passed?