Question

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Answer 1

Explanation:

1 natural indicator

2. Synthetic indicator

Answer 2

Question: An acid and a base neutralise........

Answer:

When an acid and a base are placed together, they react to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water. The compound formed by the cation of the base and the anion of the acid is called a salt.

Question: Phenolphthalein is an....................

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 is a weak acid, which can lose H+ ions in solution. The phenolphthalein molecule is colorless, and the phenolphthalein ion is pink.

Chemical formula: C20H14O4

Solubility in water: 400 mg/L

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

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