Florida Drinking Water Operator "B" Practice Test

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What is the concentration of noncarbonate hardness if the total alkalinity is 275 mg/l and total hardness is 375 mg/l?

  1. 50 mg/l

  2. 125 mg/l

  3. 100 mg/l

  4. 175 mg/l

The correct answer is: 100 mg/l

To determine the concentration of noncarbonate hardness, you first need to understand the relationship between total hardness, total alkalinity, and the components of hardness in water. Total hardness is generally composed of both carbonate (temporary) and noncarbonate (permanent) hardness. Total alkalinity primarily measures the capacity of water to neutralize acids, which is predominantly related to bicarbonates and carbonates. The formula to find noncarbonate hardness is: Noncarbonate Hardness = Total Hardness - Total Alkalinity In this situation, total hardness is 375 mg/l and total alkalinity is 275 mg/l. Substituting these values into the equation gives: Noncarbonate Hardness = 375 mg/l - 275 mg/l = 100 mg/l This calculation shows that the concentration of noncarbonate hardness is indeed 100 mg/l. This understanding of the components of hardness and alkalinity is fundamental to evaluating water quality and managing treatment processes effectively in a water utility setting.

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