An Indicator is Just a Dye That Changes Colour Flashcards
1
Q
What does the dye in the indicator change colour depend on?
A
Whether it’s above or below a certain pH
2
Q
What are indicators very useful for?
A
Estimating the pH of a solution
3
Q
What is universal indicator?
A
A useful combination of due which gives the colours mentioned before
4
Q
What do litmus paper test?
A
Whether a solution is acidic or alkaline because it changes colour at around pH 7. Red in acidic, purple in neutral, blue in alkaline
5
Q
What will phenolphthalein do in acidic and alkaline solutions?
A
From colourless in acidic solutions to bright pink in alkaline solutions
6
Q
What will methyl orange do in acidic and alkaline solutions?
A
From red in acidic solutions to yellow in alkaline solutions
