Purification of Water Experiments: The Effect of Distillation on pH and Salt Content of Seawater

The video tutorial demonstrates a series of experiments to explore the effects of distillation on seawater, focusing on pH and salt content. It begins with an introduction to the importance of purifying seawater to make it potable. The experiment involves comparing pH values of rainwater, spring water, and seawater, determining the mass of salts in seawater, and observing changes after distillation. The tutorial details the equipment used and provides a step-by-step guide to the experimental process, concluding with a summary of the results, showing a reduction in both salt content and pH after distillation.

Why is it important to purify seawater?

• To add more minerals

• To make it more acidic

• To make it suitable for drinking

• To increase its salt content

What is the acceptable pH range for potable water?

• 4.0 to 5.0

• 5.5 to 6.5

• 6.5 to 8.5

• 8.5 to 9.5

Which equipment is used to measure the mass of salts in seawater?

• Balance

• pH meter

• Bunsen burner

• Conical flask

What is the initial pH of seawater before any treatment?

• 5.2

• 6.2

• 7.1

• 8.3

How much salt was found in the initial seawater sample?

• 0.07 grams

• 0.01 grams

• 0.10 grams

• 0.05 grams

What is the purpose of using a Bunsen burner in the experiment?

• To weigh the salts

• To measure pH

• To cool the samples

• To heat the water samples

What is the main goal of distilling seawater in this experiment?

• To remove dissolved salts

• To increase its salt content

• To make it more acidic

• To add more minerals

What was the pH of seawater after distillation?

• 8.3

• 7.1

• 6.2

• 5.2

What was the mass of salts in the distilled seawater?

• 0.07 grams

• 0.01 grams

• 0.10 grams

• 0.00 grams

What was the effect of distillation on the pH of seawater?

• Increased to 9.0

• Decreased to 7.1

• Increased to 8.5

• Remained the same