Certified Water Technologist (CWT) Practice Exam 2025 - Free Water Technologist Practice Questions and Study Guide

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What is the per cent blowdown if there are 10 ppm of chloride in the feedwater and 200 ppm in the boiler blowdown water?

5%

To determine the percent blowdown, we can use the dilution formula, which relates the concentrations of a substance in both the feedwater and the blowdown. The key underlying principle is to understand that the concentration of chlorides in the blowdown is higher than in the feedwater due to the concentration that occurs in the boiler.

In this scenario, we have 10 ppm (parts per million) of chloride in the feedwater and 200 ppm in the blowdown. The relationship of these concentrations can be expressed through the formula:

\[ \text{Blowdown} = \frac{\text{Concentration in Blowdown} - \text{Concentration in Feedwater}}{\text{Concentration in Blowdown}} \]

Using the given values:

1. Concentration in blowdown: 200 ppm

2. Concentration in feedwater: 10 ppm

We can calculate the blowdown percentage as follows:

\[ \text{Blowdown} = \frac{200 - 10}{200} \]

\[ \text{Blowdown} = \frac{190}{200} \]

\[ \text{Blowdown} = 0.95 \]

To find the percentage of blowdown relative to the

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