Factory Indicator Choice
The factory indicator among the options provided is A) Methyl Orange.
Understanding Factory Indicators
Factory indicators are substances used in titrations to determine the endpoint of a reaction, particularly in acid-base titrations.
Characteristics of Methyl Orange
- Color Change: Methyl orange displays a clear color transition from red in acidic solutions (pH < 3.1)="" to="" yellow="" in="" neutral="" to="" alkaline="" solutions="" (ph="" /> 4.4).
- Application: It is particularly effective in titrations involving strong acids and weak bases, making it a common choice in laboratory settings.
Other Options Analysis
- B) Phenolphthalein: This is another pH indicator that changes from colorless in acidic solutions to pink in basic solutions (pH 8.2 - 10). While widely used, it is not categorized specifically as a factory indicator.
- C) Vanilla Essence: This is not an indicator at all; it is a flavoring agent used in cooking and baking.
- D) KMnO4 Solution: Potassium permanganate is used as an oxidizing agent in redox titrations but is not classified as a typical acid-base indicator.
Conclusion
In summary, Methyl Orange is the factory indicator from the given options. Its distinct color change at specific pH levels makes it suitable for determining the completion of acid-base reactions in a laboratory environment.