WorksheetsAcids and Alkalis
Total questions: 51
Worksheet time: 27mins
What is the only substance with a neutral pH of 7?
Milk
Orange Juice
Pure Water
Blood
All Water
In a test of pH levels, a baking soda has a pH of 9 and bleach has a pH of 12. What is true about there relationship?
Both of the solution are bases
Both of the solution are acids
The Baking soda is an acid and the Bleach is a base
The baking soda is a base and the Bleach is an acid.
Water has a neutral because
it has more H+ ions than OH-
it has more OH- ions than H+
it does not produce any ions
it has an equal amount of H+ and OH- in solution
A chemical has a pH = 6. It would be best described as
Strong acid
Strong base
Weak acid
Weak base
Substances that taste sour like lemon juice tend to be classified as
Acids
Bases
Salts
All
Substances like dark chocolate that have a bitter taste, usually indicates that it would be classified as a
Acids
Bases
Salts
All
As one moves down the pH scale from 14 to 1, what happens to the concentration of H+ in the solution?
concentration of H+ decreases
concentration of H+ increases
concentration of H+ stays the same
What does the pH scale measure?
What is the pH of a neutral solution?
around 1 - 3
around 5 - 7
7
9
A liquid has a pH of 1. What type of liquid is it?
weak acids
strong acids
weak alkaline
strong alkaline
Strong alkaline will have colour of universal indicator as (a)
what colour does Universal Indicator go in a liquid with pH of 4?
red
yellow
green
blue
Arrange these solutions in order, with most alkaline first.
pH numbers: 2 8 6 3 12 7
(a)
Tick all the substances that are more acidic than baking soda.
coffee
ammonia solution
water
battery
Drain cleaner is stronger acids compare to milk
true
false
Tick all the substances that are more alkaline than the milk
tomato
blood
vinegar
ammonia solution
Examples of everyday acids are
Orange
Sulphuric acid
Car battery
Lemon
Which indicator measures the strength of the acids or alkali?
litmus paper
pH scale
phenolphthalein
red cabbage juice.
What measurement of the pH scale is considered a neutral liquid?
0
3
7
13
9
What measurement of the pH scale is considered a weak acid liquid?
1
8
5
12
Corrosive
Acid
Base
Reacts with metals.
Acid
Base
Complete the word equation below:
Acid + alkali --> ............... + water
water
salt
gold
metal
.............................. + sodium hydroxide --> sodium chloride + water
Nitric acid
Sulphuric acid
Hydrochloric acid
Ethanoic acid
Why is toothpaste alkaline?
It can neutralise strong alkaline in
your mouth
It can neutralise acid in
your mouth
It can refresh your teeth
Toothpaste is not alkaline.
What colour is Universal indicator when the solution is neutral?
Red
Green
Blue
Purple
What type of reaction occurs when you react an acid with an alkali?
combustion
decomposition
no reaction
neutralisation
Sulphuric acid + potassium hydroxide --> ........................ + water
potassium sulphate
potassium sulphurate
potassium nitrate
magnesium hydroxide
Lithium hydroxide + nitric acid ->
Lithium nitrate + hydrogen
Lithium nitride + salt
Lithium nitrate + water
Lithium nitrate + hydroxide
ph range of acids are .....
0-6
7
8-14
4-10
ph range of alkalis are .....
0-6
7
8-14
4-10
Magnesium hydroxide + hydrochloric acid -> water + ..............
magnesium chloride
magnesium oxide
magnesium oxygen
magnesium chlorine
sulphuric acid + lithium hydroxide -> water + .............
sulphuric lithiate
lithium sulphuric
lithium sulphate
sulphur lithate
nitric acid + iron hydroxide -> iron nitrate + ..........
hydrogen
hydroxide
oxygen
water
What colour change would you see if you added nitric acid to sodium hydroxide and universal indicator?
red -> blue
purple -> green
red -> yellow
pink -> colourless
iron chloride, sodium nitrate, lithium sulphate, copper carbonate are all examples of .........
acids
alkalis
salts
mixtures
