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Cresol Red is a synthetic, organic compound used primarily as a pH indicator in various laboratory and chemical applications. It is a member of the cresol family of compounds, which are methylated phenols. Its chemical formula is C21H18O5S, and it is known for its ability to change color in response to changes in pH, making it useful for monitoring pH in different systems.
Appearance: Cresol Red is typically a red or orange solid in its pure form, but it is often available as a solution in various solvents, usually in a deep red or purple color.
pH Range: Cresol Red undergoes a color transition between pH 7.4 to 8.8. Below this range (acidic), it is yellow, and above this range (alkaline), it turns red.
Color Transition:
pH < 7.4: Yellow
pH ~7.4 to 8.8: Red
Cresol Red is a pH indicator commonly used in various laboratory applications. It is a weak acid that changes color depending on the pH of the solution it is in. The color transition occurs around a pH range of 7.4 to 8.8, making it useful for monitoring pH changes in biological and chemical systems.
Some common applications of Cresol Red include:
pH Indicator in Laboratory Experiments:Cresol Red is frequently used to measure or indicate the pH of solutions, particularly in titrations or during experiments that require precise pH control.
Cell Culture Media:In biological research, Cresol Red is used as an indicator in cell culture media to monitor pH changes in the growth medium, as the pH can shift depending on cell activity and metabolic processes.
Biochemical Assays:It is used in various biochemical assays where pH changes need to be tracked, including those studying enzyme activity, protein folding, or metabolic pathways.
Environmental Testing:Cresol Red can be used in water quality testing to monitor pH variations in aquatic systems, as it is sensitive to small shifts in pH.
Analytical Chemistry:It is also employed in certain analytical chemistry methods to detect pH changes in samples or reactions.
Overall, Cresol Red is a versatile indicator for applications where a pH range of approximately 7.4–8.8 needs to be monitored or measured.
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