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№1 слайд![Acids and Alkalis Learning](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img0.jpg)
Содержание слайда: Acids and Alkalis
Learning Objectives
To know that solutions can be sorted by whether they are: acid, alkali or neutral.
To understand that an alkali reacts with an acid to cancel it out.
To know that indicators show you how acidic or alkaline a solution is.
№2 слайд![Acids and alkalis Solutions](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img1.jpg)
Содержание слайда: Acids and alkalis
Solutions can be sorted by whether they are: acid, alkali or neutral.
№3 слайд![](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img2.jpg)
№4 слайд![Acids react with metals and](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img3.jpg)
Содержание слайда: Acids react with metals
and carbonates.
Metal + Acid Salt + Hydrogen
magnesium + magnesium chloride + hydrochloric acid hydrogen
№5 слайд![Acids Lemon juice contains](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img4.jpg)
Содержание слайда: Acids
Lemon juice contains citric acid, and vinegar contains ethanoic acid.
Some strong acids are hydrochloric acid, sulphuric acid and nitric acid.
Some weak acids are ethanoic acid, citric acid and carbonic acid.
№6 слайд![Neutralisation Acids and](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img5.jpg)
Содержание слайда: Neutralisation
Acids and alkalis react with each other. The alkali cancels out the acid in the reaction. This is called neutralisation.
№7 слайд![Salts The salt made depends](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img6.jpg)
Содержание слайда: Salts
The salt made depends on the acid and alkali used.
The salt contains the metal atom from the alkali, and part of the acid molecule.
№8 слайд![Alkalis When the oxides of](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img7.jpg)
Содержание слайда: Alkalis
When the oxides of some metals dissolve in water they make an alkali solution.
Alkalis react with acids and neutralise them.
№9 слайд![Alkalis Alkalis are present](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img8.jpg)
Содержание слайда: Alkalis
Alkalis are present in many cleaning substances in use in our homes.
Kitchen cleaners are alkaline because they contain ammonia or sodium hydroxide, which attack grease.
№10 слайд![Indicators They change colour](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img9.jpg)
Содержание слайда: Indicators
They change colour in acid or alkaline solutions.
Different indicators change to different colours.
№11 слайд![Litmus Test Litmus is an](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img10.jpg)
Содержание слайда: Litmus
Test
Litmus is an indicator. It changes colour in acid and alkaline solutions.
Litmus is red in an acid.
Litmus is blue in an alkali.
№12 слайд![Universal Indicator Universal](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img11.jpg)
Содержание слайда: Universal Indicator
Universal indicator changes colour in acids and alkalis.
№13 слайд![The pH scale](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img12.jpg)
Содержание слайда: The pH scale
№14 слайд![Applications of](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img13.jpg)
Содержание слайда: Applications of Neutralisation
Indigestion: Our stomach carries
around hydrochloric acid.
Too much of this leads to indigestion.
To cure indigestion, you can neutralise the excess acid with baking soda or specialised indigestion tablets.
№15 слайд![More Applications of](/documents_6/2ee68399a70112cd6b3a5553ce7f0732/img14.jpg)
Содержание слайда: More Applications
of Neutralisation
Factory Waste: Liquid waste from factories is often acidic. If it reaches a river it will destroy and kill sea life of many forms. Neutralising the waste with slaked lime can prevent this.