Acids, Alkalis and neutralisation Flashcards
1
Q
What colour does blue litmus paper turn when citrus acid is added?
A
Red
2
Q
What colour does blue litmus paper turn when sodium hydroxide (alkaline) is added?
A
Blue/ it stays the same
3
Q
What colour does red litmus paper turn when hydrochloric acid is added?
A
Red / stays the same
4
Q
What colour does red litmus paper turn when soap is added?
A
Blue
5
Q
What number on the pH scale is dark red?
A
0
6
Q
What number on the pH scale is dark purple?
A
14
7
Q
What number on the pH scale is green?
A
7
8
Q
What colour on the pH scale is 12?
A
dark blue / indigo
9
Q
What colour on the pH scale is 3?
A
yellow / orangey yellow
10
Q
What colour on the pH scale is 6?
A
light green
