Water Treatment and Solution Chemistry

The video tutorial covers the distribution of salt and fresh water on Earth, explaining that 97% is salt water and only 3% is fresh. It then details a foul water lab process, including sand gravel and charcoal filtration, and distillation, to demonstrate water purification. The tutorial also explains solubility curves, showing how solutions can be saturated, unsaturated, or super saturated, and how they react to temperature changes and solute additions.

What percentage of the Earth's water is fresh and accessible?

• 97%

• 3%

• 0.62%

• 21%

What is the primary function of the sand gravel filter in the foul water lab?

• To remove odors

• To remove large particles

• To remove dissolved salts

• To add fluoride

What change occurs to the water after charcoal filtration?

• It becomes colored and odorous

• It remains dark and cloudy

• It becomes clear and odorless

• It loses all conductivity

Why is complete removal of all particles from water not always desirable?

• It is too expensive

• It increases water temperature

• Some particles are beneficial

• It makes water taste bad

What is the primary goal of the distillation process in the foul water lab?

• To add beneficial minerals

• To remove odors

• To remove conductive particles

• To remove large particles

What does a solubility curve represent?

• The density of water at different pressures

• The solubility of a solute at various temperatures

• The freezing point of water

• The boiling point of water

What happens to a saturated solution when the temperature is increased?

• It becomes supersaturated

• It becomes unsaturated

• It remains saturated

• It precipitates crystals

How does an unsaturated solution react to the addition of more solute?

• The solution becomes saturated

• The solute precipitates

• The solution becomes supersaturated

• The solute dissolves

What is the result of adding a crystal to a supersaturated solution?

• The crystal dissolves

• The solution remains unchanged

• The solution becomes unsaturated

• Crystals precipitate out

What is the effect of cooling a saturated solution?

• It becomes unsaturated

• It remains saturated with possible crystal formation

• It dissolves more solute

• It becomes supersaturated