Question

phenolphthalein indicator preparation ​

Answer 1

Answer:

Phenolphthalein indicator preparation ​

• Take 0.5 g of phenolphthalein and weigh it.

• Mix 50 ml ethanol with 50 mL water to get a 50 percent ethanol (ethyl alcohol) solution.

• In a 50 percent ethanol solution, fully dissolve the phenolphthalein.

• Use an eyedropper to apply from a bottle.

Explanation:

The chemical compound phenolphthalein has the formula $C_{20} H_{14} O_{4}$ and is shortly known as "HIn" or "phph" in shorthand notation. In acid-base titrations, phenolphthalein is frequently used as an indicator. It turns colorless in acidic solutions and pink in basic solutions for this application.

Between pH 8.3 and 10.5, the color of phenolphthalein varies noticeably.