Question

Pink colour in an acid solution is because of :
A. Brownian Movement
B. Litmus paper reaction
C. Phenolphthalein reaction
D. Dehydration
E. Deliquescent

Answer 1

Hint: Indicator - a chemical dye that changes color depending on the hydrogen ion or hydroxide ion concentration in the same solution.

Complete step by step answer:
The phenolphthalein indicator permits chemists to visually recognize whether a substance is an acid or a base. The color change in phenolphthalein is an outcome of ionization, and this alters the shape of the phenolphthalein molecules.
The explanation behind the obvious light retention is the structure of the pink type of the phenolphthalein pointer. Because of ionization, the electrons in the atom are more delocalized than in the boring structure. Quickly, delocalization is when electrons in a particle are not related with a solitary molecule, and rather are spread over more than one atom. An expansion in delocalization moves the energy hole between sub-atomic orbitals. Less energy is required for an electron to take the leap into a higher orbital. The ingestion of energy is in the green locale, 553 nanometers, of the light range. The natural eye sees a pink tint in the arrangement. The more grounded the basic arrangement is, the more the phenolphthalein pointer changes and the hazier the pink tone will be.

Therefore the correct option is C. Phenolphthalein reaction

Additional Information:
In the chemistry laboratory, phenolphthalein is mostly used in acid-base titrations. A solution of known concentration is carefully added into one of unknown concentration.

Note:
Before, phenolphthalein has been utilized as a purgative. It was a constituent of Ex-Lax for the over-the-counter help of blockage. Nonetheless, it was prohibited from use in the United States in 1999 after examination demonstrated it as a potential cancer-causing agent (disease causing operator).