Starting with red roses describe how A solution containing red pigment may be prepared The solution can be shown to be an indicator?

Red roses contain a pigment called anthocyanin, which gives them their vibrant red color. To prepare a solution containing red pigment, one could extract the anthocyanin from the petals of red roses by crushing them and mixing them with a solvent such as ethanol or water.

To show that the solution containing red pigment is an indicator, one could perform a pH test. Anthocyanin pigments change color depending on the pH of the solution they are in. In acidic solutions, anthocyanins appear red, while in alkaline solutions they appear blue or purple. By adding a few drops of the red pigment solution to different solutions with varying pH levels, one can observe the color change and demonstrate that the red pigment is indeed an indicator.

Preparation of a Solution Containing Red Pigment from Red Roses:

1. Extract the pigment: Place a handful of red rose petals in a beaker and add enough boiling water to cover them. Let the mixture steep for 30-60 minutes, stirring occasionally.
2. Filter the solution: Strain the liquid through a cheesecloth or coffee filter to remove the petals. You will obtain a reddish-purple filtrate.
3. Concentrate the solution: If desired, the solution can be concentrated by evaporating some of the water. Place the filtrate in a Petri dish or shallow dish and let it air-dry for several hours or overnight. The concentrated solution will appear more intensely red.

Demonstration of the Indicator Properties of the Red Rose Pigment Solution:

1. Introduce a few drops of acid: Add a few drops of a strong acid, such as hydrochloric acid or sulfuric acid, to a small sample of the red rose pigment solution. The solution will turn bright yellow or orange.
2. Introduce a few drops of a base: Add a few drops of a strong base, such as sodium hydroxide or potassium hydroxide, to the solution. The solution will revert back to its original reddish-purple color.

This reversible color change is an indication of the presence of an acid-base indicator. In acidic conditions (low pH), the pigment exists in its yellow form (anthocyanin cation), while in basic conditions (high pH), it exists in its purple form (anthocyanin anion).

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