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# Water Treatment Questions and Answers (Q&A)

Repa

The pH scale runs from 0 to 14 according to the book page 570 (Chapter 11 Section 7.A)

H. Martin, Content Writer
The answer to this is B. In order to solve this, you need to divide the gallons with the square feet which means that 2,800,000 that you will divide with 500. The answer that you will get is 5600...Read More

True. Many countries still have source of suitable drinking water without treatment.

E. Austin, Content Writer
The correct answer to this question is E, 1.56%. To get this answer, we can divide the given values in the word problem. We will divide the 28 thousand gallons of filter water by the 1.8 million...Read More

C. Wasek, Philanthropist
The question does not suggest that the shape is irregular and so to calculate the answer in cubic feet, you merely have to multiply the length by the width by the height of the basin. It is...Read More

R. Glover, Editor
The correct answer to this item is letter D. To get the surface area of a circle, one must use the formula r squared multiply by pi. Since the radius is not given, divide the diameter by 2. So,...Read More

I agree that proof of professional competence is essential ('C')l, but I think that 'D' should be added as well since there is no better way to demonstrate knowledge of essential rules and...Read More

RagweedFarmer, Editor
92mL/min, 92.0297
There are two difficult aspects to this problem, specific gravity, and the percentage of alum in the solution.
Math Constant: Specific gravity of water = 1

RagweedFarmer, Editor
2.1
mg/l and ppm are the same
1.6 million gallons x 8.34lbs per gallon = 13.344 million pounds, so 13.344 is 1ppm of 1.6 million gallons
28lbs / 13.344 =2.0983213 rounded to...Read More

A. The curve of the surface of a liquid
C. The proper line of vision to read a liquid in a buret

RagweedFarmer, Editor
1.9444444 gallons per minute per foot
math constant: 1440 minutes in one day
step 1: 1,400,000 gallons divided by 1440=972.22222 gallons per minute
step 2: 972.22222 gallons per...Read More

RagweedFarmer, Editor
5616 pounds
math constant: 1 cubic foot of water = 62.4lbs, in case you forget the weight of one cubic foot you can multiply the weight of a gallon of water 8.34lbs times the volume in one...Read More

RagweedFarmer, Editor
149,600 gallons
math constant: 1 cubic foot holds 7.48 gallons
20,000 x 7.48 = 149,600...Read More

RagweedFarmer, Editor
11.25 gallons of 8% polymer
this problem could be a bit confusing because the 150 gallons has less than 1% polymer
Step 1: convert percentages to usable numbers 0.6%=0.006 and 8%=0.08Read More  