1
Q
pH scale
A
a number scale for measuring how acidic or basic a
solution is
2
Q
acids
A
ABOVE 7 y are chemical
compounds that produce a solution with a pH of less than 7 when they
dissolve in water.
3
Q
BASES
A
above 7 compounds that produce a solution of pH of
more than 7 when they dissolve in water
4
Q
neutral
A
7 ph
5
Q
pH indicators
A
chemicals that change colour depending on the pH of the solution they
are placed in
6
Q
Bromothymol blue
A
6.0–7.6 yellow to blue
7
Q
Indigo carmine
A
11.2–13.0 blue to yellow
8
Q
Methyl orange
A
3.2–4.4 red to yellow
9
Q
, phenolphthalein
A
a
colourless chemical compound in acidic or slightly basic
solutions but turns pink in moderately basic to highly basic
solutions
