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1) If the total area of the clarifier is 25,000 m2 and the L/W = 5, what is the width of the clarifier?

a) 5000 m

b) 71 m

c) 158 m

d) 355 m

2) The molecular weight of orthophosphate (PO43-) is 95 g/mole and the concentration is 20 mg/L. What is the concentration in meq/L?

a) 9.5 meq/L

b) 14.25 meq/L

c) 20 meq/L

d) 4.75 meq/L

3) At a pOH = 11.5, the [H+] =

5) A sample of water has a calcium concentration of 1.2 meq/L and a magnesium concentration of 0.3 meq/L. The total hardness in mg/L as CaCO3 is:

[removed]

75 mg/L as CaCO3

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1.5 mg/L as CaCO3

[removed]

60 mg/L as CaCO3

[removed]

15 mg/L as CaCO3

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