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Phenolphthalein
Phenolphthalein- Structure: Phenolphthalein is a chemical compound used as an indicator in chemistry. It is a weak acid that is colourless in acidic solutions and turns pink in alkaline solutions. This makes it useful for identifying whether a solution is acidic or alkaline.
Spirogyra structure
The cell wall of Spirogyra is composed of cellulose and is covered with a slime layer that contains the chloroplasts. The chloroplasts are embedded in the slime layer and are not in contact with the cell wall. The cytoplasm of the cell is divided into two parts by a septum. The flagella are attached to the cell wall at the anterior end. The posterior end is enlarged and contains the nucleus and other organelles.
Phenolphthalein Solution
A phenolphthalein solution is a clear, colorless liquid that is often used as a chemical indicator. It has a pinkish hue when it is in an alkaline solution and a colorless hue when it is in an acidic solution.
Phenolphthalein Structure
The phenolphthalein molecule is a weak organic acid with a molecular formula of C20H14O4. It is a colorless, odorless solid that is soluble in organic solvents. The phenolphthalein molecule contains a phenyl group bonded to a phthalate group. The phenyl group is a aromatic hydrocarbon and the phthalate group is a plasticizer.
Properties of Phenolphthalein
Phenolphthalein is a chemical compound with the formula C 20 H 14 O 4 . It is a weak acid that is white in color, and is used as a laxative and to test for the presence of blood in urine. Phenolphthalein is a derivative of phthalic anhydride.
Synthesis of Phenolphthalein
A solution of phenolphthalein (C20H14O3) in ethanol (C2H5OH) is prepared by dissolving 1.00 g of phenolphthalein in 100.0 mL of ethanol.
- To a solution of 1.00 g phenolphthalein in 100.0 mL ethanol is added 1.00 mL of 1.0 M HCl.
- The solution is mixed and allowed to stand for 1 hour.
- The solution is then diluted to 200.0 mL with distilled water.
Phenolphthalein Uses
Phenolphthalein is used as a chemical indicator in a variety of different settings. For example, it can be used to test the pH of a liquid. If the pH is above 9, the phenolphthalein will be colorless. If the pH is below 8, the phenolphthalein will be pink.
Harmful Effects of Phenolphthalein
- Phenolphthalein is an irritant. It can cause skin irritation, redness, and swelling.
- It is also a respiratory irritant. It can cause coughing, wheezing, and shortness of breath.
- Ingesting phenolphthalein can cause vomiting and diarrhea. It can also be toxic, and may cause serious health problems.
