acids and alkalis Flashcards
1
Q
what scale goes from 0 - 14?
A
The pH scale
2
Q
what is an acid in the pH scale?
A
anything above 7, the strongest is acid has pH 0
3
Q
what is an alkali in the pH scale?
A
anything below 7, the strongest alkali has pH 14
4
Q
what substance has a pH 7?
A
neutral substance (e.g. water)
5
Q
what is an indicator?
A
something that changes colour depending on whether it is an acid or in an alkali
6
Q
what is litmus paper?
A
a quite popular indicator?
7
Q
what do acids turn blue litmus paper to?
A
red
8
Q
what do alkalis turn red litmus paper to?
A
blue
9
Q
what is a universal indicator solution?
A
mixture of dyes
10
Q
how can an indicator be used?
A
colour change has to be obvious
