How do you know when the endpoint is reached in a titration? When does this occur?

Before a titration, indicator is added to the analyte (which is in the flask, and usually the chemical of unknown concentration).  The titrant is then placed in a burette and slowly titrated into the analyte.  When the indicator changes color is when the endpoint of the titration has been reached.  This occurs (approximately) at the equivalence point.

a plasma is a warm ionized gasoline consisting of approximately equal numbers of definitely charged ions and negatively charged electrons. the characteristics of plasmas are notably unique from the ones of ordinary neutral gases in order that plasmas are considered a awesome "fourth kingdom of remember."