Prelaboratory Questions And Problems

1. What is the difference between disinfection and sterilization?

2. What does the constant k in the integrated form of the Chick equation represent?

3. What does available free chlorine mean?

4. The chlorine disinfection treatment uses a 4.5 ppm NaOCl solution. It can be prepared from a 4—5% commercial solution. Assuming that this last concentration is 4.5%, indicate the amount of the commercial solution that must be diluted in order to prepare 5 mL of a 4.5 ppm solution.

5. How does the disinfection mechanism differ when using ultraviolet radiation alone vs using this radiation with titanium oxide?

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