4.

Calcium hypochlorite's effectiveness as a disinfectant is enhanced by:

a. Low temperature and low pH.

b. Low temperature and high pH.

c.

High temperature and low pH.

d. High temperature and high pH.

5.

How many mg of available chlorine are present in 20 liters of water having a

chlorine residual of 5 ppm? ________ mg.

6.

Chlorine residual is:

a. Dosage minus demand equal residual.

b. The amount of chlorine dosage consumed by substances in water.

c.

The sum of the free and combined available chlorine found in water.

d. The amount of chlorine left in water after flocculation and disinfection.

7.

How many ounces of available chlorine are present in a 3,000-gal storage tank of

water having a chlorine residual of 10 ppm? ______ oz.

8.

How much calcium hypochlorite (70 percent available chlorine) was required to

establish the residual in 7 above assuming that there was no chlorine demands?

_____ oz.

9.

How much Ca(CI0)2 was required to establish the residual in seven above if the

chlorine demand was 4 ppm? ______oz.

10.

How much CA(CIO)2 is required to batch chlorinate two 3,000-gal storage tanks if

the chlorine demand is 5 ppm and the required chlorine residual is 1 ppm? ___ oz.

11.

If a sample of water that has just been chlorinated (using the chlorination kit) has a

chlorine residual of 10 ppm, and 30 minutes later it has a chlorine residual of 5

ppm, what is the chlorine demand? _______ ppm.

MD0160

2-25

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