the universal indicaicator tells you the pH of a substance.
Green nuetral pH7
Below pH 7 is acidic,red
Above pH7 is alkalie blue/purple
Use universal indicator or litmus paper
The universal Indicator was invented in 1923 by Yamada
Universal Indicator Red was created in 1993.
Universal Indicator Blue was created in 1992.
Universal Indicator Green was created in 1995.
Universal Indicator Yellow was created in 1993.
Citric acid typically does not turn red when tested with a universal indicator. Citric acid is a weak acid and will likely show a color close to neutral or slightly acidic on the indicator scale.
Universal indicator is just that - an indicator. It is not intended as an accurate measurement system.
it is universal indicator with mixture of alkali
Its pH and if a solution is an acid or base.
The universal indicator turns red in acidic solutions.
Green is the color that universal indicator turns to when it is neutral.