What is the correct order of steps in the procedure for testing the chlorine residual level of treated water?

The correct order of steps in the procedure for testing the chlorine residual level of treated water emphasizes the importance of hygiene and accurate testing methods.

Starting with washing hands is crucial to prevent contamination of the water sample and the testing materials. This step ensures that any external contaminants do not interfere with the accuracy of the test results. Following this, dispensing water into a clean container is the next logical step. It is essential to collect the water sample after ensuring hands are clean, as the integrity of the water being tested is paramount for reliable results.

After dispensing the treated water, the next step involves holding the test strip in the water sample. This step allows the test strip to absorb the water and thus react with the chlorine present. Finally, comparing the test strip to the color chart provided determines the chlorine residual level, which is vital for ensuring the water is safe for consumption.

Each step builds on the previous one, reinforcing proper sanitation techniques while also ensuring the testing process is effective. This systematic approach helps ensure that the readings obtained are both accurate and reflective of the actual chlorine levels in the treated water.