Orange Tornado

The video tutorial demonstrates a precipitation reaction using mercury chloride and potassium iodide solutions. It explains the setup and observation of the reaction, where an orange precipitate forms and vanishes. The chemical process involves the dissociation of salts into ions, leading to the formation of mercury iodide and a secondary reaction producing potassium Tetraioda mercurate. The tutorial also highlights the application of precipitation reactions in water treatment to remove toxic ions.

What is required to demonstrate a precipitation reaction?

• Copper sulfate, zinc, and a thermometer

• Iron filings, sulfur, and a magnet

• Mercury chloride, potassium iodide, and a magnetic stirrer

• Sodium chloride, water, and a heater

What happens when mercury chloride is added to the vortex of potassium iodide solution?

• A blue precipitate forms and remains

• An orange precipitate forms and then vanishes

• No visible change occurs

• The solution turns green

What is the purpose of using a magnetic stirrer in the demonstration?

• To heat the solution

• To create a vortex for clear observation

• To cool the solution

• To change the color of the solution

What ions are formed when potassium iodide and mercury chloride dissolve in water?

• Only mercury ions

• Only potassium ions

• Potassium, iodide, and mercury ions

• Chloride and iodide ions

What compound is formed when excess ions react with mercury iodide precipitate?

• Potassium Tetraioda mercurate

• Mercury sulfate

• Sodium iodide

• Potassium chloride

What is the color of the compound potassium Tetraioda mercurate?

• Orange

• Blue

• Colorless

• Green

How do water treatment plants use precipitation reactions?

• To increase water temperature

• To dissolve toxic ions

• To form solids that can be filtered out

• To add minerals to water