Water Sample Analysis Techniques

The video tutorial guides viewers through the process of collecting a water sample, adding chemical solutions, and performing a titration to measure dissolved oxygen levels. It emphasizes the importance of preventing unwanted oxygen from entering the sample and provides detailed steps for each part of the process, including the use of specific solutions and the titration technique to achieve accurate results.

What is the first step in retrieving a water sample?

• Add chemical solutions

• Find the water sampling bottle and its cap

• Submerge the bottle in water

• Tilt the bottle at an upright angle

Why is it important to prevent unwanted oxygen from entering the water sample?

• It will make the solution clear

• It will make the water sample heavier

• It will change the color of the solution

• It will drastically affect the test results

What happens when you add magnesium sulfate and alkaline potassium iodide to the water sample?

• A yellow precipitate forms

• The solution becomes clear

• The solution turns red

• The solution turns blue

What is the purpose of adding sulfuric acid to the water sample?

• To make the solution clear

• To dissolve the yellow precipitate

• To make the solution orange with reddish fragments

• To turn the solution blue

What color should the solution be after adding sulfuric acid and dissolving the fragments?

• Yellow

• Orange

• Blue

• Clear

What is the goal of the titration process?

• To achieve a pale yellow color

• To make the solution blue

• To dissolve the precipitate

• To add more sulfuric acid

What should you do if the titrator empties during the titration process?

• Stop the process

• Start over from the beginning

• Refill the titrator with the solution

• Add more sulfuric acid

What is the purpose of adding the starch indicator solution?

• To dissolve the precipitate

• To turn the solution blue

• To achieve a clear solution

• To make the solution orange

How do you calculate the dissolved oxygen in PPM?

• By counting the drops of sulfuric acid

• By measuring the weight of the solution

• By the amount of thiosulfate solution used

• By the color of the solution

What does 12 mL of thiosulfate solution used indicate?

• 24 PPM dissolved oxygen

• 12 PPM dissolved oxygen

• 6 PPM dissolved oxygen

• 0 PPM dissolved oxygen