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Summary Mark Scheme of Acids and Redox booklet
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  • Acids and Redox
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  • OCR

This is the mark scheme of the acids and redox booklet that I have uploaded before. It, unfortunately, didn't attach to the same document so you will find it here.

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

Subjects

  • salts
  • chemstry ocr a
  • acids and redox
  • alkali and bases
  • titrations
  • neutralizationns
  • ionic equations
  • as level

Written for

  • A/AS Level
  • OCR
  • Chemistry A
  • Acids and Redox
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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: A species that releases H+ ions into aqueous solution.
Strong Acid: An acid that dissociates completely in solution.
Weak Acid: An acid that dissociates partially in solution.

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

Hydrochloric Acid HCl
Sulphuric Acid H2SO4
Nitric Acid HNO3
Phosphoric Acid H3PO4
Ethanoic Acid (vinegar) CH3COOH

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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