Color Changes in Chemical Reactions

The video explores Le Chatelier's Principle through two experiments. The first uses bromothymol blue to demonstrate how pH changes affect equilibrium, with hydrochloric acid and sodium hydroxide altering the color of solutions. The second experiment involves copper(II) chloride, showing how temperature and chloride ions shift equilibrium, affecting solution color. The video concludes with a summary of the experiments and their outcomes.

What is the initial color of bromothymol blue when hydrogen ions are attached?

• Green

• Yellow

• Blue

• Red

What happens to the color of the test tube when hydrochloric acid is added?

• It turns red

• It remains green

• It turns yellow

• It turns blue

How does the addition of sodium hydroxide affect the equilibrium in the test tube?

• No change in equilibrium

• Shifts equilibrium to the left

• Equilibrium is destroyed

• Shifts equilibrium to the right

What is observed when additional sodium hydroxide is added to the second test tube?

• The color turns green

• The color turns red

• The color turns blue

• The color remains yellow

What is the color of the solution when copper(II) chloride is in a hot water bath?

• Yellow

• Green

• Red

• Blue

How does the cold water bath affect the color of the copper(II) chloride solution?

• No change

• Turns it green

• Turns it red

• Turns it blue

What effect does the addition of calcium chloride have on the test tube?

• Turns the solution green

• Turns the solution blue

• Turns the solution red

• No color change

What is the effect of ethanol on the equilibrium position in the final test tube?

• Shifts equilibrium to the left

• Shifts equilibrium to the right

• No effect on equilibrium

• Equilibrium is destroyed

What is the color of the test tube from the hot water bath?

• Yellow

• Green

• Red

• Blue

What is the final observation when ethanol is added to the test tube?

• The solution turns blue

• The solution turns red

• The solution turns green

• The solution remains unchanged