C3: Strong and Weak Acids and Alkalis + Titrations

Hey, here is a document mainly for students taking AQA Triple Science, but can help others too. It contains information from the C3 (chemistry) section on acids, alkalis and titrations. I hope this helps you to revise! Please rate and comment on how to improve :D

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  • Created on: 07-04-10 18:28
Preview of C3: Strong and Weak Acids and Alkalis + Titrations

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C3: Strong and Weak Acids and Alkalis
Acids and alkalis vary in strength as well as concentration.
Titrations can be used to find the amounts of acid or alkali in a
solution
An acid can be defined as a proton donor. A base can be defined
as a proton acceptor.
Water must normally be present for a substance to act as an acid
or as a base.
Acids produce hydrogen ions in aqueous solution. The H+ ion is a
proton. In water this proton is hydrated and is represented as
H+(aq).
Alkalis produce hydroxide ions, OH-(aq), in aqueous solutions.
Acids and alkalis are classified by the extent of their ionisation in
water.
A strong acid or alkali is one that is completely ionised in water.
Examples of strong acids are hydrochloric, sulfuric and nitric
acids. Examples of strong alkalis are sodium and potassium
hydroxide.
A weak acid or alkali is only partially ionised in water.
Examples of weak acids are ethanoic, citric and carbonic acids.
An example of a weak alkali is ammonia solution.
The volumes of acid and alkali solutions that react with each other
can be measured by titration using a suitable indicator:
strong acid + strong alkali ­ any acidbase indicator
strong acid + weak alkali ­ methyl orange indicator
weak acid + strong alkali ­ phenolphthalein indicator.
If the concentration of one of the reactants is known, the results of
a titration can be used to find the concentration of the other
reactant.

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Sally

This is great, thanks!

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