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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