Phenolphthalein can be synthesized by condensation of phthalic anhydride with two equivalents of phenol under acidic conditions. It was discovered in 1871 by Adolf von Baeyer.
What does phenolphthalein do to the body?
Phenolphthalein is an organic compound used as a laboratory reagent and pH indicator. Phenolphthalein exerts laxative effects by stimulating the intestinal mucosa and constricting smooth muscles.
What reagent will produce phenolphthalein?
Phenolphthalein is synthesized by condensation of phthalic anhydride with phenols.
Why was phenolphthalein used in the experiment?
A strong acid- strong base titration is performed using a phenolphthalein indicator. Phenolphtalein is chosen because it changes color in a pH range between 8.3 – 10. It will appear pink in basic solutions and clear in acidic solutions.
What is phenolphthalein indicator made of?
phenolphthalein, (C20H14O4), an organic compound of the phthalein family that is widely employed as an acid-base indicator. As an indicator of a solution’s pH, phenolphthalein is colourless below pH 8.5 and attains a pink to deep red hue above pH 9.0.
What’s the chemical name for phenolphthalein?
| IUPAC Name | 3,3-bis(4-hydroxyphenyl)-2-benzofuran-1-one |
|---|---|
| Molecular Formula | C20H14O4 |
| Molar Mass | |
| InChI | InChI=1S/C20H14O4/c21-15-9-5-13(6-10-15)20(14-7-11-16(22)12-8-14)18-4-2-1-3-17(18)19(23)24-20/h1-12,21-22H |
| InChI Key | KJFMBFZCATUALV-UHFFFAOYSA-N |
What are the risks of phenolphthalein?
Eye: May cause eye irritation.
What is the end point of phenolphthalein?
The end point for phenolphthalein acidity is pH 8.3.
Is phenolphthalein a base or acid?
Phenolphthalein is a colourless, weak acid which dissociates in water forming pink anions. Under acidic conditions, the equilibrium is to the left,and the concentration of the anions is too low for the pink colour to be observed.
What is the nature of phenolphthalein?
– Phenolphthalein (HIn) is weakly acidic in nature and in aqueous solution, it dissociates into H+ and In− ions.
How do you synthesize phenolphthalein?
Phenolphthalein can be synthesized by phthalic anhydride condensation with two phenol equivalents under acidic conditions. Adolf von Baeyer discovered it in 1871.
What is the chemical name of phenolphthalein?
The name phenolphthalein indicates that the substance is made from phenol and phthalic acid. Test tube, beaker (400 ml), pipettes, filter Phenol (C), phthalic anhydride (Xn), concentrated sulfuric acid (C), sodium hydroxide solution (c=1 mol/l; C), hydrochloric acid (c=1mol/l; Xi).
What is phenolphthalein used to titrate?
Phenolphthalein is commonly used as a chemical indicator, which turns from colorless to pink in the range of 8–10 pH, which makes it ideal for the titration of strong acids, such as hydrochloric acid. Phenolphthalein is used as a laxative to treat incomplete and infrequent bowel movement.
Why does phenolphthalein change colour?
Answer: Phenolphthalein is an indicator, based on whether it reaches an acid or a base, a chemical that changes colour. If it meets something basic, such as ammonia, it turns purple; if it meets an acid like vinegar or a neutral material like water, it remains colourless. Share this with your friends
