Problem 3.7: You add 5 pounds of NaCl to a 1000gallon

From Chapter 3 Problem Set. Level 2: Applied Thinking.

Question

You add 5 pounds of NaCl to a 1,000-gallon cooling loop. Assuming complete dissolution, estimate the increase in concentration (ppm).

Answer

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Water mass: 1,000 gal × 8.34 lb/gal = 8,340 lb. Weight of resulting solution = 8,340 lb + 5 lb = 8,345 lb. ppm increase: (5 lb / 8,345 lb) × (1,000,000) ≈ 599 ppm.