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WorksheetsAcids, Bases, Salts, Indicators & Reactions
Total questions: 20
Worksheet time: 23mins
What is the difference between a base and an alkali?
The table below names five acid-base indicators and shows the colours seen at various pH values.
The pH values of some solutions are:
Sulphuric acid pH= 1.0
Carbonic acid pH= 5.5
Ammonia pH= 9.0
Sodium hydroxide pH= 12.0
By using the CODE letters of indicators, answer the following question.
Which indicators show the same colour in sodium hydroxide?
A and B
B and D
D and E
B and C
What is the colour of methyl orange in an acid?
Red
Yellow
Orange
Colourless
Which of the following is a neutral substance?
Hydrochloric acid
Lemon juice
Ammonia
Sodium chloride solution
Give another name for lime water.
Potassium oxide
Calcium oxide
Calcium hydroxide
Sodium hydroxide
Which of the following pH is strongly acidic?
5.0
9.5
2.0
13.4
Give the products formed when Zinc reacts with Hydrochloric acid?
Zinc and Hydrogen gas
Zinc chloride and Oxygen
Zinc chloride and Hydrogen gas
Zinc and salt
Which of the following is most likely to be basic?
Orange juice
Laundry detergent
Vinegar
Coke
Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?
Strongly acidic
Strongly basic
slightly acidic
slightly basic
What is the colour of blue litmus in an acid?
Pink
Red
Purple
Colourless
Define an indicator.
It is a flower/plant extract
It is a commercial made substance
It is a substance which show different colour when in and acid or a base
It is a substance which when reacts with an acid forms salt and water as the only products
When hydrogen ion concentration is greater than hydroxide ion concentration, the solution is
basic
acidic
neutral
alkaline
An indicator was used to test a water solution with a pH of 12. Which indicator colour would be observed?
Colourless phenolphthalein
Colourless litmus
Red litmus
Pink phenolphthalein
How would you classify the substance being tested?
Acidic
Basic
Neutral
None of the above
Tick the correct properties of bases:
They are sour to taste
They are slippery to touch
They may or may not be soluble in water
They are not strong
Acetic acid is used as...
an ingredient in vinegar
limewater
milk of magnesia
a cleansing agent
How does an antacid help?
To correct excess acidity in stomach
To neutralise the effect of a bee sting
to neutralise acidity in soil
It is harmful. It doesn't help in anything.
Potassium phosphate and water are formed when these two chemicals react?
Nitric acid + Zinc carbonate will produce
In order for an acid to react with a metal, the metal must be?
