Strength of Acids and Alkalis (1)

Chemistry

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The types of acids

Strong Acids and Weak Acids

Definition of strong acid

An acid that ionises completely in water to produce a high concentration of hydrogen ions

The example of strong acid

Hydrochloric acid, HCl

The factor that hydrochloric acid, HCl is a strong acid

All molecules of hydrogen chloride, HCl that dissolve in water are ionised completely to hydrogen ions and chloride ions

Definition of Weak acid

An acid that ionises partially in water to produce low concentration of hydrogen ions

The strength of an acid

Depends on the degree of dissociation or ionisation of the acid in water

Strong acid

Is an acid that ionises completely in water to produce a high concentration of hydrogen ions, H+

The reason which hydrochloric acid, HCl is a strong acid (1)

Because all molecules of hydrogen chloride, HCl that dissolve in water are ionised completelyto hydrogen ions, H+ and chloride ions, Cl–

The reason which hydrochloric acid, HCl is a strong acid (2)

Because no molecule of hydrogen chloride, HCl exists in this solution

Complete ionisation of hydrogen chloride, HCl

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