Crystal Violet and Its Decolorization

What happens to crystal violet when it is mixed with water?

• It becomes a dark, greenish yellow solution.

• It turns into a vibrant, violet solution.

• It remains a powder.

• It dissolves completely without changing color.

What is the role of resonance in the structure of crystal violet?

• It allows the molecule to absorb light in the visible spectrum.

• It causes the molecule to dissolve in water.

• It makes the molecule unstable.

• It prevents the molecule from reacting with other chemicals.

How does a spectrophotometer help in studying crystal violet?

• It measures how much light the solution absorbs.

• It calculates the molecular weight of the solution.

• It determines the pH level of the solution.

• It measures the temperature of the solution.

Why does crystal violet appear violet to our eyes?

• It absorbs all colors equally.

• It absorbs yellow light and reflects violet.

• It absorbs violet light and reflects yellow.

• It does not absorb any light.

What is the complementary color of yellow, which explains the violet appearance of crystal violet?

• Green

• Blue

• Violet

• Red

What is the purpose of using a spectrophotometer in the experiment?

• To measure the temperature of the solution.

• To determine the concentration of hydroxide ions.

• To measure the absorption of light by the solution.

• To calculate the molecular weight of crystal violet.

What happens when hydroxide ions react with crystal violet?

• The solution becomes more colorful.

• The resonance in the molecule is disrupted.

• The solution becomes more acidic.

• The crystal violet molecule gains a positive charge.

What structural change occurs in crystal violet when it reacts with hydroxide ions?

• The molecule becomes more positively charged.

• The central carbon atom loses its positive charge.

• The molecule forms a new nitrogen bond.

• The molecule gains additional hydrogen atoms.

What is the main reason for the color change in crystal violet when it is decolorized?

• The solution becomes more acidic.

• The electrons are no longer delocalized.

• The solution absorbs more light.

• The solution becomes more basic.

What is the effect of increasing hydroxide concentration on the decolorization of crystal violet?

• It speeds up the decolorization process.

• It slows down the decolorization process.

• It changes the color of the solution to green.

• It has no effect on the decolorization rate.