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Sagot :
Two properties are :
Bromcresol green is useful as an acidity indicator because it changes to yellow as the pH becomes more acidic
Also, the bromcresol green protons are easily dissociated making the color change visible and relatively quick.
Why is bromocresol green used as an indicator?
Bromocresol green (BCG) is a dye of the triphenyl methane family (triarylmethane dyes). It belongs to a class of dyes called sulfonephthaleins. It is used as a pH indicator in applications such as growth mediums for microorganisms and titrations.
How does a pH indicator work?
pH indicators detect the presence of H+ and OH-. They do this by reacting with H+ and OH-: they are themselves weak acids and bases. If an indicator is a weak acid and is colored and its conjugate base has a different color, deprotonation causes a color change.
What is chemical change and physical change?
Physical changes are reversible and do not produce a new substance. Chemical changes result in the production of a new substance and cannot be reversed.
Learn more about pH Indicators :
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