Neutralization
If an acid is added to an alkali, neutralization takes place.
The higher the concentrationof H+ ions the lower pH
Alkalis contain all OH- ions (hydroxide ions)
Neutralization contains this reaction:
H++OH-=h2o
Neutralization leaves no free h+ ions
Acids and alkalis
Acids are substances that produce hydrogen in aqueous solution
The pH scale
When universal indicator is added to solutions it changes colo
Acidic = red/orange/yellow = 0-6 pH
Neutral = green = 7 pH
Alkali = blue/purple = 8-14 pH
Making a salt
A soluble salt can be prepared by reacting an acid with a suitable insoluble reactant like:
A metal
A metal oxide
A metal hydroxide
A carbonate
The insoluble reactant chosen depends upon particular salt required
For example, copper does not react with dilute acids so this metal can not be used. One the other hand sodium is too reactive to be used safely.
As the reaction between metals and acids produce flammable hydrogen, chemists usually make salts by reacting a metal oxide or a metal carbonate with an acid.
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year 9 science revision
General Fictionthis book is for anyone who struggles with revision chemistry-making a salt -acids and alkalis -neutralization -the pH scale biology-osmosis -active transport ...
