Chemical Equilibrium and Color Changes

The video tutorial explores Le Chatelier's Principle to predict equilibrium shifts in a reaction involving Fe3+ and SCN- ions. It demonstrates the effects of adding various substances like iron (III) nitrate, potassium thiocyanate, sodium sulfite, sodium fluoride, and silver nitrate on the reaction's color and equilibrium. Each addition causes a distinct change, illustrating the principle's application in predicting chemical behavior.

What principle is used to predict the shift in equilibrium when a system is disturbed?

• Dalton's Law

• Le Chatelier's Principle

• Avogadro's Law

• Boyle's Law

What color change is expected when iron (III) nitrate is added to the reaction mixture?

• The solution turns green

• The solution becomes more orange

• The solution turns blue

• The solution becomes colorless

What happens to the color of the solution when potassium thiocyanate is added?

• The solution turns blue

• The solution becomes cloudy

• The color becomes more intense

• The color fades

How does the addition of sodium sulfite affect the iron ions in the solution?

• Fe3+ forms a precipitate

• Fe2+ is oxidized to Fe3+

• Fe3+ is reduced to Fe2+

• Fe2+ forms a complex ion

What is the effect of adding silver nitrate to the solution?

• It causes the solution to become more acidic

• It forms a complex ion with Fe3+

• It increases the concentration of Fe3+ ions

• It removes thiocyanate ions by forming a precipitate