Question

14.Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are

1 point

(a) red and blue

(b) blue and red

(c) pink and colourless

(d) colourless and pink

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Answer 1

Answer:

Phenolphthalein [3,3-Bis (4- hydroxyphenyl)- 2 benzofuran- 1-one] is often used as an indicator in acid-base titrations. It turns colourless in acidic solutions and pink in basic solutions.

so option C

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Answer 2

Answer:

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes.

Chemical formula: C20H14O4

Melting point: 258–263 °C (496–505 °F; 531–536 K)

Solubility in water: 400 mg/L

Solubility in other solvents: Insoluble in benzene and hexane; very soluble in ethanol ...

Explanation:

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