pH and Indicators Flashcards
1
Q
pH less than 7 is…
A
acidic
2
Q
pH more than 7 is…
A
alkaline
3
Q
pH equal to 7 is…
A
neutral
4
Q
what is an indicator?
A
an indicator is a substance that changes colour to tell you about the pH of a solution
5
Q
colour changes of methyl orange indicator?
A
acidic colour = red
neutral colour = yellow
alkaline colour = yellow
6
Q
colour changes of phenolphthalein indicator?
A
acidic colour = colourless
neutral colour = colourless
alkaline colour = pink
7
Q
colour changes of red litmus paper?
A
acidic colour = red
neutral colour = (stays red)
alkaline colour = blue
8
Q
colour changes of blue litmus paper?
A
acidic colour = red
neutral colour = (stays blue)
alkaline colour = blue
9
Q
universal indicator colours for pH scale
A
- pH 0-3 = red
- pH 3-4 = orange
- pH 5-6 = yellow
- pH 7 = green
- pH 8-10 = light blue
- pH 11-13 = dark blue
- pH 14 = purple
