Strong & Weak Acids (AQA GCSE Chemistry): Flashcards

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Strong & Weak Acids
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What do acids release in water

\ceH+\ce{H+} ions and anions

What determines if an acid is strong or weak

Extent of dissociation

Definition of strong acids

Acids that completely dissociate in water

pH level of strong acids

Low pH

Three examples of strong acids

\ceHCl\ce{HCl}, \ceHNO3\ce{HNO3}, \ceH2SO4\ce{H2SO4}

Definition of weak acids

Acids that only partially dissociate in water

Type of dissociation in weak acids

Reversible with equilibrium established

Example of a weak acid

Ethanoic acid (\ceCH3COOH\ce{CH3COOH})

pH level of weak acids vs strong acids

Higher pH

Relation between \ceH+\ce{H+} conc. and pH

As \ceH+\ce{H+} increases, pH decreases

pH change for tenfold increase in \ceH+\ce{H+}

Decreases by 1 unit

Factor of \ceH+\ce{H+} decrease from pH 1 to pH 3

100

What acid strength refers to

Ability to dissociate in water

What acid concentration refers to

Amount of acid dissolved in solution

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