Question

What will be the color of phenolphthalein and methyl orange in soap solution?

Answer 1

Phenolphthalein:

1. Phenolphthalein, (C₂₀H₁₄O₄), is an organic compound of the phthalein family that is widely employed as an acid-base indicator.
2. As an indicator of a solution's pH, phenolphthalein is colorless below pH 8.5 and attains a pink to deep red hue above pH 9.0.

Methyl orange:

1. Methyl orange is a pH indicator frequently used in titration because of its clear and distinct color variance at different pH values.
2. Methyl orange shows red color in the acidic medium and yellow color in the basic medium.
3. Because it changes color at the pH of a mid-strength acid, it is usually used in titration for acids.

Colour in Soap solution:

1. Soap is generally basic in nature so soap solution will be basic. Thus Phenolphthalein shows pink color in soap solution.
2. Methyl orange shows red color in the acidic medium and yellow color in the basic medium. Soap solution is basic in nature and turns the color of the solution into yellow.

Final answer: Yellow is the color of phenolphthalein and methyl orange in soap solution.