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Questions and Answers
What defines a substance as a disinfectant?
What defines a substance as a disinfectant?
- It prevents the growth of microorganisms on living surfaces.
- It kills bacteria and other microorganisms on non-living things. (correct)
- It is effective at a concentration of 0.2%.
- It has a strong acidic property.
What is a characteristic of antiseptics compared to disinfectants?
What is a characteristic of antiseptics compared to disinfectants?
- They can be used on non-living surfaces.
- They have a higher pKa value.
- They prevent the growth of microorganisms on living surfaces. (correct)
- They are always stronger than disinfectants.
Which phenol has the lowest pKa value?
Which phenol has the lowest pKa value?
- 2-methyl phenol
- Carbolic acid
- Ethanoic Acid
- Methanoic Acid (correct)
Which of the following phenols is commonly used in Dettol?
Which of the following phenols is commonly used in Dettol?
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Which of the following correctly pairs a phenol with its application?
Which of the following correctly pairs a phenol with its application?
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Study Notes
Phenols
- Phenol is formed when a hydrogen atom in a benzene ring is replaced by a hydroxyl group (-OH).
- Phenol is also known as carbolic acid.
- Phenols have various types and properties.
- Carbolic acid (phenol) has a pKa of 10.
- Ethanoic acid has a pKa of 4.74.
- Methanoic acid has a pKa of 3.74.
- 2-methyl phenol (or ortho cresol) is a type of phenol.
- 4-chloro-3,5-dimethyl phenol is found in Dettol.
- 2,4,6-trinitrophenol (or picric acid) is used in burnol cream for skin burns.
- Phenols are used as both disinfectants and antiseptics due to their mild acidic properties.
- Disinfectants kill bacteria and other microorganisms and are applied to non-living things.
- Antiseptics prevent the growth of bacteria and other microorganisms and kill germs on living tissue.
- A 1% aqueous solution of phenol is a common disinfectant.
- A 0.2% aqueous solution of phenol is a common antiseptic.
- The same chemical can act as both a disinfectant and antiseptic, depending on the application (environment/living).
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