Secret writing

The video tutorial demonstrates how goldenrod paper can be used as an acid-base indicator. It explains the importance of using real goldenrod paper and original Windex with ammonia to create a visible reaction. By writing on the paper with wax, the reaction can be controlled, as the wax prevents ammonia from reaching the paper. The tutorial also highlights the reversible nature of the reaction, showing how a hair dryer can return the paper to its original color by evaporating the ammonia.

What is the role of goldenrod paper in the experiment?

• It is used to clean surfaces.

• It is a source of ammonia.

• It serves as an acid-base indicator.

• It acts as a base.

Why is it important to use original Windex in the experiment?

• It contains a special dye.

• It is cheaper than other cleaners.

• It contains ammonia, which is a base.

• It has a pleasant smell.

How does the wax from the candle affect the reaction on the goldenrod paper?

• It makes the paper more absorbent.

• It changes the color of the paper.

• It prevents the ammonia from reaching the paper.

• It enhances the reaction.

What happens to the goldenrod paper when a hair dryer is used?

• The wax melts completely.

• The paper turns blue.

• The paper becomes wet.

• The color change is reversed as ammonia evaporates.

What is the significance of the reaction being reversible?

• It allows the paper to be reused.

• It makes the paper more durable.

• It shows that the reaction can be undone by removing ammonia.

• It changes the texture of the paper.