MSJChem - Tutorial videos for IB Chemistry
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    • Topic 1 Stoichiometric relationships
    • Topic 2 Atomic structure
    • Topic 3 Periodicity
    • Topic 4 Bonding
    • Topic 5 Energetics
    • Topic 6 Kinetics
    • Topic 7 Equilibrium
    • Topic 8 Acids and bases
    • Topic 9 Oxidation and reduction
    • Topic 10 Organic chemistry
    • Topic 11 Measurement and data processing
  • HL Syllabus
    • Topic 12 Atomic structure HL
    • Topic 13 Periodicity HL
    • Topic 14 Bonding HL
    • Topic 15 Energetics HL
    • Topic 16 Kinetics HL
    • Topic 17 Equilibrium HL
    • Topic 18 Acids and bases HL
    • Topic 19 Redox HL
    • Topic 20 Organic chemistry HL
    • Topic 21 Measurement and data processing
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Topic 18 Acids and bases HL

18.1 Lewis theory of acids and bases 
Understandings:
A Lewis acid is a lone pair acceptor and a Lewis base is a lone pair donor.
When a Lewis base reacts with a Lewis acid a coordinate bond is formed.
A nucleophile is a Lewis base and an electrophile is a Lewis acid.



18.1 Lewis theory vs Bronsted-Lowry theory (HL)
Guidance:
Relations between Brønsted–Lowry and Lewis acids and bases should be discussed. 
This video is a comparison between the Lewis theory and the Bronsted-Lowry theory of acids and bases. 

18.2 Temperature dependence of Kw
Guidance:
This video covers the effect of temperature on the value of the Kw. 
Temperature dependence of Kw worksheet 

18.2 Acid and base dissociation constants (Ka and Kb)
Understandings:
The expression for the dissociation constant of a weak acid (Ka) and a weak base (Kb).


Ka and Kb worksheet

18.2 Calculating the Ka or Kb of a weak acid or base
This video covers how to calculate the Ka or Kb of a weak acid or base.

18.2 Ka, pKa, Kb, pKb, Kw, pKw
Understandings:
For a conjugate acid base pair, Ka × Kb = Kw.
The relationship between Ka and pKa is (pKa = -log Ka), and between Kb and pKb is (pKb = -log Kb).
Applications and skills:
Discussion of the relative strengths of acids and bases using values of Ka, pKa, Kb and pKb.




18.2 Calculating pH of weak acids and bases
Applications and skills:
Calculations involving pH, pOH, Ka and Kb. 

18.3 pH curves 
Understandings:
The characteristics of the pH curves produced by the different combinations of strong and weak acids and bases.

Applications and skills:
The general shapes of graphs of pH against volume for titrations involving strong and weak acids and bases with an explanation of their important features.




18.3 pH curves part 2 
Understandings:
The buffer region on the pH curve represents the region where small additions of acid or base result in little or no change in pH.
Applications and skills:
Only examples involving the transfer of one proton will be assessed. Important features are:
intercept with pH axis
equivalence point
buffer region
points where pKa = pH or pKb = pOH.


18.3 Salt hydrolysis 
Applications and skills:
Prediction of the relative pH of aqueous salt solutions formed by the different combinations of strong and weak acid and base.




18.3 Acid-base indicators 
Understandings:
An acid–base indicator is a weak acid or a weak base where the components of the conjugate acid–base pair have different colours.

Applications and skills:
Selection of an appropriate indicator for a titration, given the equivalence point of the titration and the end point of the indicator.


18.3 Buffer solutions 
Understandings:
The composition and action of a buffer solution.
Applications and skills:
While the nature of the acid–base buffer always remains the same, buffer solutions can be prepared by either mixing a weak acid/base with a solution of a salt containing its conjugate, or by partial neutralization of a weak acid/base with a strong acid/base.


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  • Home
    • About
    • Blog
    • Online tutoring
    • Privacy policy
  • Member's Area
  • SL Syllabus
    • Topic 1 Stoichiometric relationships
    • Topic 2 Atomic structure
    • Topic 3 Periodicity
    • Topic 4 Bonding
    • Topic 5 Energetics
    • Topic 6 Kinetics
    • Topic 7 Equilibrium
    • Topic 8 Acids and bases
    • Topic 9 Oxidation and reduction
    • Topic 10 Organic chemistry
    • Topic 11 Measurement and data processing
  • HL Syllabus
    • Topic 12 Atomic structure HL
    • Topic 13 Periodicity HL
    • Topic 14 Bonding HL
    • Topic 15 Energetics HL
    • Topic 16 Kinetics HL
    • Topic 17 Equilibrium HL
    • Topic 18 Acids and bases HL
    • Topic 19 Redox HL
    • Topic 20 Organic chemistry HL
    • Topic 21 Measurement and data processing
  • Options
    • SL Option A
    • HL Option A
    • SL Option B
    • HL Option B
    • SL Option C
    • HL Option C
    • SL Option D
    • HL Option D
  • Exam review