The document discusses a lesson on neutralization reactions that includes several learning activities and assessments. The key points are: 1. The lesson objectives are to describe examples of neutralization reactions and explain how pH changes during neutralization reactions using indicators. 2. Learning activities include predicting reactants and products of neutralization reactions, explaining the formation of salts and water, and analyzing data to determine the most effective indigestion remedy. 3. Assessments are used to check students' understanding of neutralization concepts like pH changes and examples of common neutralization reactions and their products.

1. Analyse data about indigestion remedies to decide which remedy is the most effective (15)
Elaborate the changes to indicators in terms of pH when acids and alkalis are mixed (13)
Predict the reactants or products of different neutralisation reactions (11)
Explain the formation of salt and water during neutralisation, giving some examples of common salts (11)
Describe some examples of neutralization (6)
Explain that some changes results in the formation of new materials (3)
Recognise some changes can be physical or chemical. (2)
Outcomes addressed in the lesson:

2. Topic: Neutralisation
Learning Outcome: Students will be able to
 Predict the reactants or products of different
neutralisation reactions using some examples.
 Explain the formation of salt and water during
neutralisation, giving some examples of common salts
Learning Objective:
To describe examples of neutralization reaction and
changes to indicators in terms of pH.

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Starter: Recap: Acids: true or false?

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Recap: Alkalis: true or false?

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Recap: What is the order of pH?

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Brain Teaser: Mixing an acid and an alkali
What happens when an acid and an alkali are mixed?
+ 
acid alkali

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https://www.youtube.com/watch?v=RmnT9jwX4gQ
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https://www.youtube.com/watch?v=8UiuE7Xx5l8
Explore

8. What happens during neutralisation? (Mixing acid with alkali)
Concept Cartoon

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Task 1 : Neutralisation
Create an information sheet/ poster/mind map covering the
Highlighting aspects of neutralisation:
1. Changes to pH and indicators
2. Uses and examples of neutralization
3. Chemical reaction of neutralization (reactants, products)

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Mixing acids and alkalis
Challenge:
What colour change
would be seen as
the solution changed
from a strong alkali
to neutral?

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Challenge:
What would be seen
if more acid was
added after the
neutral point was
reached.
pH change during neutralization

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Mixing an acid and an alkali
What happens when an acid and an alkali are mixed?
Mixing an acid and an alkali causes a chemical reaction
and it forms a salt.
How could you check that a chemical reaction has taken place?
+ 
acid alkali

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What is neutralization?
The chemical reaction between an acid and an alkali is called
neutralization.
What is the pH value of the mixture of salt and water?
The chemical reaction between an acid and an alkali can be
written as:
+ 
acid alkali salt + water
+ 
acid alkali salt + water
The mixture of salt and water is neutral, so its pH is 7.

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Task 1: Uses of Neutralisation: Neutralizing stings
Bee stings are acidic.
Which safe household
substances could you
use to treat a bee sting?
Wasp stings are alkaline.
Which safe household
substances could you
use to treat a wasp sting?
Mild alkali like bicarbonate
of soda
Vinegar

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AFL-

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• Part B

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Starter / AFL - Examples of Neutralisation
• Our saliva is alkaline, and it
neutralises some of the acid
made by bacteria in our
mouth.
• Toothpaste also
neutralizes the acid in
our mouth.
• Antacid tablets help to
neutralise excess acid from
the stomach (acidity).
• Industries such as textile and paper
factories produce lots of alkaline
waste. They must neutralise it with
acid before disposing the waste.

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Application- Indigestion remedies:
Indigestion and heartburn are caused
by an excess of acid in your stomach.
Indigestion remedies contain
antacids, like magnesium
oxide and calcium carbonate
and are called bases.
These don’t dissolve in water,
but react with acids.
What do you think antacids do
to the acid in your stomach?
The acid in your stomach that helps you break down your food
is called hydrochloric acid. It has a pH of between 1 and 2.

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What is neutralization?
The chemical reaction between an acid and an alkali is called
neutralization.
What is the pH value of the mixture of salt and water?
The chemical reaction between an acid and an alkali can be
written as:
+ 
acid alkali salt + water
+ 
acid alkali salt + water
The mixture of salt and water is neutral, so its pH is 7.

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Making salts (LO 9, 14,15)
The salt produced by a neutralization reaction depends on
the acid and the alkali used.
Sodium chloride is produced by the reaction between
hydrochloric acid and sodium hydroxide.
Which acid and which alkali would be needed to make the
salt potassium chloride?
potassium
hydroxide
hydrochloric
acid
+ 
potassium
chloride
water
+
+  +
sodium
hydroxide
sodium
chloride
hydrochloric
acid
water

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Naming salts
 When an alkali reacts with hydrochloric acid, the salt
produced is a chloride.
 When an alkali reacts with sulfuric acid, the salt produced
is a sulfate.
 When an alkali reacts with nitric acid, the salt produced is
a nitrate.
Which acid would be needed to make these salts?
1. copper nitrate
2. magnesium chloride
3. sodium sulfate
Task 1

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Making salts: completing equations

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Making salts: word equations
potassium
hydroxide
hydrochloric
acid
+ 
potassium
chloride
water
+
sodium
hydroxide
sulfuric acid + 
sodium
sulfate
water
+
potassium
hydroxide
nitric acid + 
potassium
nitrate
water
+
Complete these word equations:

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Task 2- Differentiated

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AFL- Differentiated

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Mid Plenary: Neutralization Reactions
1. Name one of the new products formed when acids and
alkalis mix.
water; salt
2. Describe what combines from each of the acid and the
alkali to form water.
hydrogen; hydroxide
3. Suggest the pH of pure water
pH 7
(Textbook questions page 136)

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1. Describe two reasons why we
have acid in the stomach.
4. List some of the main ingredients
found in heartburn remedies.
5. Explain how antacids reduce the
acidity of stomach acid.
6. Suggest the effect of antacid
remedies on the pH of stomach acid.
Mid Plenary: Indigestion remedies
(Textbook questions 146-147)

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1. Describe two reasons why we have acid in the stomach.
digestion of proteins; prevention of the survival of some bacteria
4. List some of the main ingredients found in heartburn remedies.
Calcium carbonate; magnesium hydroxide
5. Explain how antacids reduce the acidity of stomach acid.
An alkali (or base) neutralises the stomach acid; making the solution less acidic
6. Suggest the effect of antacid remedies on the pH of stomach acid.
Increase the pH
Answers

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• A group of students wanted to
compare the effectiveness of different
commercial antacid remedies.
• They first added universal indicator to
a beaker of hydrochloric acid to check
that it was a strong acid (pH 1).
• They added the recommended dose of
each antacid to the acid. The students
observed any colour change and
noted how long any change took.
Plenary: Which indigestion remedy?

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Task 3 Analyzing data about indigestion remedies
• To compare the effectiveness of different commercial antacid remedies.
• Students first added universal indicator to a beaker of hydrochloric acid to check
that it was a strong acid (pH 1).
• They added the recommended dose of each antacid to the acid. The students
observed any colour change and noted how long any change took.

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7. Explain why it was important to start with acid of pH 1.
8. Describe which remedy is the most effective. Explain your answer as fully as
possible.
9. Another student suggests that the experiment is repeated using crushed ‘Acid-
ban’ tablets, rather than whole tablets. Suggest how this will affect the time
taken to change the pH.
Analyzing data about indigestion remedies
(Textbook questions 7-9, page 147)

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7. Explain why it was important to start with acid of pH 1.
stomach acid is approximately pH 1–2
8. Describe which remedy is the most effective. Explain your answer as
fully as possible.
‘Acid-ease’ liquid; it changes the pH from 1 to 6; takes only 3 minutes
9. Another student suggests that the experiment is repeated using
crushed ‘Acid-ban’ tablets, rather than whole tablets. Suggest how this
will affect the time taken to change the pH.
The time may decrease; because of increased surface area of ‘Acid-ban’
tablets
Answers

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Extension Task
Try and find out how the fire services deal with a large scale spillage of acid. (Internet research)
Quiz time
https://quizizz.com/admin/quiz/601aa1ed385b47001b57b287