Question 6015 of 223 · California Water Treatment Operator Exam
How many pounds of dry chemical are in 50 gallons of a 10 percent solution, if the solution weighs 8.34 lb/gal?
Exactly one answer is correct.
You got of questions right. Here on the question pages nobody remembers which ones you got wrong. The trainer saves your progress and asks the mistakes again until they stick.
Or free: the 10 questions most people get wrong
Show solution
Correct answer to question 6015
- A: 41.7 lb
Explanation
Weight of solution = 50 x 8.34 = 417 lb, and 10 percent of that is 41.7 lb. Forgetting the percent gives 417.
More questions: Treatment Exam Math
- 6016A 0.25 percent solution contains how many mg/L of chemical? (1 percent = 10,000 mg/L)
- 601712 lb of dry chemical is dissolved in 100 lb of water. What is the percent strength of the solution?
- 6018How many gallons of a 1 percent solution can be made from 5 gallons of a 12 percent solution?
- 6019A plant treats 2 MGD with a chlorine dose of 2.5 mg/L using 12.5 percent hypochlorite weighing 10 lb/gal. How many gallons per day of solution are needed?
- 6020A chemical feed pump must deliver 33.4 gal/day. What setting in mL/min is needed? (1 gal = 3,785 mL)
- 6021The chlorine demand of a water is 2.3 mg/L. How much chlorine must be fed to leave a 1.0 mg/L residual?