Solutions to I-Practice Math #2
8.
Two solutions are being combined. 250
gallons of a solution containing 1.5 lbs of chemical per gallon of solution is
being added to 1,500 gallons containing 4.8 lbs of chemical per gallon of
solution. The solution contains
_____ pound(s) of chemical.
250 gal x 1.5 lbs of chemical/gal of solution = 375 lbs of chemical
1,500 gal x 4.8 lbs of chemical/gal of solution = 7,200 lbs of chemical
375 lbs + 7,200 lbs = 7,575 lbs of chemical
9.
Two solutions are being combined. 250 gallons of a solution containing
1.5 lbs of chemical per gallon of
solution is being added to 1,500 gallons containing 4.8 lbs of chemical per gallon of solution.
The weight of chemical in the new solution is _____ lbs/gal.
250 gal + 1,500 gal = 1,750 gal of solution
7,575 lbs/1,750 gal = 4.33 lbs of chemical/gallon of solution
10.
A drum contains 55 gallons of a chemical solution with a specific gravity
of 1.12. The dry chemical weighs _______ pounds.
55 gal x 8.34 lbs/gal x 1.12 = 514 lbs
11.
A dosage of 7 mg/L into a flow of 250,000 gpd uses ________ lbs/day of
chemical.
250,000 gpd/(1 mgd/1,000,000 gpd) = 0.25 mgd
0.25 mgd x 7 mg/L x 8.34 lbs/gal = 14.6 lbs/day
12.
Twenty-five pounds of chemical per day are being added to a flow of 500
gpm is _______ mg/L.
500 gpm x 1440 min/day = 720,000 gpd
720,000 gpd/(1 mgd/1,000,000 gpd) = 0.72 mgd
25 lbs/day/(0.72 mgd x 8.34 lbs/gal) = 4.16 mg/L
13.
The maximum rate for a chemical feeder is 640 lbs/day. The feed rate is
_____ pounds/minute.
640 lbs/day/1440 min/day = 0.444 lbs/min
14.
The solution in a 15 foot by 35 foot by 55 foot tank with a specific
gravity of 1.05 weighs _____ pounds.
15 ft x 35 ft x 55 ft x 7.48 gals/cubic foot x 8.34 lbs/gal x 1.05 =
1,891,381 lbs
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