Table of Contents
What is 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 is phenolphthalein short answer?
Phenolphthalein is a chemical compound with the formula C20H14O4 and is often written as “HIn” or “phph” in shorthand notation. 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.
What is phenolphthalein in Hindi language?
फिनाप्थलीन (एक रंगहीन ठोस स्फटिक पदार्थ) (phinapthalin (ek ranagahin Thos sphaTik padarth))( noun ) English Usage : phenophthalein is used in chemical -labs .
What is the function of phenolphthalein?
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.
What is the pH range of phenolphthalein?
8.2 – 10.0
Indicator Range
| Indicator | Colour | pH range |
|---|---|---|
| Bromothymol Blue | yellow | 6.0 – 7.6 |
| Phenol Red | yellow | 6.8 – 8.4 |
| Thymol Blue – 2nd change | yellow | 8.0 – 9.6 |
| Phenolphthalein | colourless | 8.2 – 10.0 |
How do you make phenolphthalein?
Preparation of Phenolphthalein Indicator (Acid/Base Indicator)
- – Weigh out 0.5 g of phenolphthalein.
- – Prepare a 50% ethanol (ethyl alcohol) solution consisting of 50ml ethanol and 50 ml water.
- – Dissolve the phenolphthalein thoroughly in the 50% ethanol solution.
- – Use from a bottle fitted with an eye dropper.
Is phenolphthalein toxic?
Phenolphthalein is highly toxic as defined by the OSHA Laboratory Standard.
What is phenolphthalein and methyl orange?
Colour in acidic solution: Colourless. Colour in basic solution: Pink. Methyl orange: Colour in acidic solution: Red.
What is phenolphthalein used for?
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 are some uses for phenolphthalein?
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. However, phenolphthalein is no longer used as a laxative due to the suspected carcinogenicity of this compound.
What does phenolphthalein do in an acid?
Phenolphthalein is a weak acid and is colorless in solution although its ion is pink. If hydrogen ions (H +, as found in an acid) were added to the pink solution, the equilibrium would switch, and the solution would be colorless. Adding hydroxide ions (OH -, as found in bases) will change the phenolphthalein into its ion and turn the solution pink.
What does phenolphthalein react with?
Phenolphthalein is a presumptive test that reacts with the heme molecule present in blood. A positive reaction gives a pink color.
What is the turning point of phenolphthalein?
In chemical analysis it is used as an indicator of acid-base titrations, its turning point being around the pH value of 8.2 – 8.3, making the color transition from colorless to pink. Phenolphthalein is normally dissolved in alcohol for use in experiments.