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Chemistry Unit 2- WJEC
Acids, Bases and Salts
pH scale and indicators
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Cards (27)
What is acid in water?
An
acidic
solution
What is a base in water?
An alkaline solution
What is pure water?
Neutral
What are indicators?
Substances that change colour when added to
acidic
/
alkaline
solutions
What are the three categories of the pH scale?
Acid,
neutral
and
alkali
What do the red and orange colours of the pH scale indicate?
Strong
acid
What do the yellow and light green colours show in the pH scale?
Weak acid
What does green indicate on the pH scale?
Neutral
What does light blue show on the pH scale?
Weak alkali
What does dark blue and purple show in the pH scale?
Strong
alkali
What are the numbers that indicate acid on the pH scale?
0-6
What number represents neutral on the pH scale?
7
What numbers represent alkali on the pH scale?
8-14
What does a strong acid do more than weak acid?
Fizz
,
float
and
move
Are pH values lower in strong acid than weak acid?
Yes
Is the rate of reaction lower in strong acids than weak acids?
No
Does strong or weak acid have a higher temperature rise than the other?
Strong
What do acidic solutions release in solution?
H+
ions
What are some examples of strong acids?
Hydrochloric
Nitric
Sulfuric
What are some examples of weak acids?
Ethanoic
Citric
Carbonic
What do alkali solutions contain?
OH-
ions
What are some examples of strong alkalis?
sodium
hydroxide
potassium
hydroxide
What are some examples of weak alkalis?
Ammonia
Ammonium hydroxide
What is a neutralisation reaction?
When an
alkali
is added to an
acid
to
neutralise
it
What is the neutralisation reaction?
H+
+
OH-
->
H2O
What is a dilute acid?
Acid
molecules
mixed
with a
large amount
of
water
What is a concentrated acid?
Little
to
no water
molecules
mixed
with
acid