By David Fowkes on Friday, 23 February 2018
Category: IGCSE Chemistry

Acids, Alkalis and pH

Background 

You should already know that:

• some substances are acidic
• the opposite of acidic is alkaline 
• acids and alkalis can be harmful 
• we can measure acidity or alkalinity using the pH scale

Strong acids

​When an acid molecule ionises completely when in solution in water, it is regarded as a strong acid. It is said to dissociate completely.

If we consider this ionisation to be an equilibrium - it would lie completely to the right.

The equilibrium constant (Kc) would be a very large value and not really useful.

When calculating pH values for strong acids we assume that the concentration of H+ ions is equal to to the concentration of the acid. 

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