Metacresol purple
Metacresol Purple
Metacresol Purple (pronunciation: meh-tuh-kree-sol pur-pul) is a pH indicator commonly used in biology and chemistry.
Etymology
The term "Metacresol Purple" is derived from its chemical composition and its color. "Meta" refers to the position of the hydroxyl group in the cresol component of the compound, while "purple" refers to the color it turns in alkaline solutions.
Usage
Metacresol Purple is used as a pH indicator in various scientific experiments. It changes color depending on the pH of the solution it is in. In acidic solutions (pH less than 4.8), it is yellow. In neutral to slightly alkaline solutions (pH between 4.8 and 6.0), it is purple. In strongly alkaline solutions (pH greater than 6.0), it is yellow again.
Related Terms
- pH indicator: A chemical compound that is used to determine the pH of a solution.
- Acid: A substance that donates protons or hydrogen ions and/or accepts electrons.
- Base: A substance that accepts protons or hydrogen ions and/or donates electrons.
- Alkaline: A term referring to a base, a substance that accepts protons or hydrogen ions and/or donates electrons.
- Cresol: An organic compound which is a methylphenol. There are three forms (ortho-, meta-, and para-) differing only by the location of the methyl group.
External links
- Medical encyclopedia article on Metacresol purple
- Wikipedia's article - Metacresol purple
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