Table of Contents
What is mean by self indicator?
Answer: The Self Indicator is basically a chemical substance that along with self-participation in the reaction, can indicate the end point of a titration or some other reaction. Example: KMNO4 is self indicator.
How do self indicators work?
The Self Indication is essentially a chemical product that along with self-participation in the reaction, will mark the end point of a titration or some other reaction. But to suggest colour change, certain markers such as litmus do not modify its own chemical composition.
Why KMnO4 is a self indicator?
KMnO4 solutions are dark purple. When used as a titrant, as soon as the endpoint is reached and the KMnO4- is in excess, the solution has a permanent pink hue (provided that the solution is initially colorless). Thus KMnO4 acts as its own indicator.
What is self indicator and external indicator?
Internal indicators are those in which one of the reactant act as self indicator. Eg KMnO4 act as self indicator in Permanganate titrations. External indicators are which are added from outside and detects the change in pH etc. eg Phenolphthalein and Methyl Orange added in Acid base titrations.
What is the definition of a self indicator?
Simply a self indicator is a rectant in any reaction which itself indicates the end point of reaction by changing the color of reaction mixture. There is no need of adding any indicator.
What is external indicator?
External Indicators:- Indicator which never takes part in the original chemical reaction but after completion of reaction it also changes the color of solution to indicate the endpoint. External indicators is not recommended as it leads to loss of some volume of the reaction mixture.
Why is KMnO4 a self indicator of titration?
Why Kmno4 Is A Self Indicator Why KMnO4 is a Self Indicator Potassium Permanganate is a flexible and potent oxidant which can be used by overt or indirect titration to classify many compounds. A special value of Potassium Permanganate is that it acts as an indicator of its own.
Which is an example of an internal indicator?
An example of internal indicator is Diphenyl Amine, which is used in the titration of Mohr,s salt and Potassium Permanganate. Some more examples are Methyl Orange, Methyl Red, Phenolphthalein etc