What is the color change of turmeric paper when dipped into a basic solution?

a)
Blue

b)
Red

c)
Yellow

d)
Green

Correct answer is option 'B'. Can you explain this answer?

Question

What is the color change of turmeric paper when dipped into a basic solution?a)Blueb)Redc)Yellowd)GreenCorrect answer is option 'B'. Can you explain this answer?

Answer

Color Change of Turmeric Paper in Basic Solution

Turmeric paper is a pH indicator made by impregnating filter paper with turmeric extract. Turmeric contains a compound called curcumin, which exhibits a characteristic color change in the presence of acids and bases. When turmeric paper is dipped into a basic solution, it undergoes a color change from its original yellow color to red.

Turmeric as a pH Indicator

Turmeric is commonly used as a natural pH indicator due to the presence of curcumin, which is a pH-sensitive compound.

The color of curcumin is influenced by the concentration of hydrogen ions (H+) in a solution, which determines its pH.

In acidic solutions, curcumin appears yellow, while in basic solutions, it turns red.

Color Change in Basic Solution

When turmeric paper is dipped into a basic solution, the curcumin molecules in the turmeric extract undergo a chemical reaction.

In basic solutions, the curcumin molecule accepts hydrogen ions (H+) from the solution, resulting in a change in its structure.

This structural change leads to a shift in the absorption spectrum of curcumin, causing it to reflect red light instead of yellow.

As a result, the turmeric paper changes from its original yellow color to red when exposed to a basic solution.

Importance of pH Indicators

pH indicators, such as turmeric paper, are essential tools in chemistry to determine the acidity or basicity of a solution.

They provide a quick and visual indication of the pH level, allowing scientists and researchers to identify the nature of a solution.

By using pH indicators, the pH of a solution can be determined without the need for complex equipment or procedures.

Turmeric paper, in particular, is a natural and easily accessible pH indicator that can be used in various educational and scientific experiments.

In conclusion, when turmeric paper is dipped into a basic solution, it changes from yellow to red due to a chemical reaction between the curcumin molecules and hydrogen ions in the solution. This color change is a result of the altered structure and absorption spectrum of curcumin in basic conditions. Turmeric paper serves as a useful pH indicator in chemistry to determine the acidity or basicity of a solution.

Answer

Turmeric paper turns red when dipped into a basic solution, indicating the basic nature of the substance.

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