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Summary Acids and Redox Booklet
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This booklet has summarized everything you need to know about Acids and Redox OCR A levels. Everything in this booklet is covered in the specification of OCR. You will have definitions of key terms, explanations of alkalis and bases, titrations, acids, redox, and many more. Each page will have exer...

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  • May 14, 2022
  • 12
  • 2021/2022
  • Summary

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AS level Chemistry
OCR (Chemistry A – H032, H432)




Acids and Redox

Includes:
Acids
Bases
Neutralisations
Titrations
Preparing standards
Acid-base titration method


Redox

, Acids

Definition
Acids: ………………………………………………………………………………………………………………….
Strong Acid: ………………………………………………………………………………………………………………….
Weak Acid: …………………………………………………………………………………………………………………..

Common acids that you will have come across already through science are:

Hydrochloric Acid ……………
Sulphuric Acid ……………
Nitric Acid ……………
Phosphoric Acid ……………
Ethanoic Acid (vinegar) ……………

When an acid dissociates the H+ is left in the solution:
HCl (aq)  H+ (aq) + Cl- (aq)
H2SO4 (aq)  2H+ (aq) + SO42- (aq)

Water in the solution is always in excess.


Acids can come with different strengths: strong and weak.
Strong acids, like the 2 examples above, the H+ completely dissociates.
Weak acids, like in the example below, however only partially dissociates in a
solution. This means only a small amount of the H+ ions in the compound are
separated.

CH3COOH (aq) H+ (aq) + CH3COO- (aq)

The equilibrium symbol is used as the reaction is not complete, and there is both a
forward and a backward reaction.
There are 4 possible hydrogen atoms that could dissociate from the ethanoic acid,
however only 1 does, and this also does not happen in all ethanoic acid compounds.

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