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A Level Chemistry LessonsHow to deduce Nature of Salt in Salt HydrolysisA salt can be acidic, neutral or alkaline.
We can deduce the nature of the salt from its constituent ions, namely:
1. ion formed from a weak acid will be a conjugate base, eg CH3COO- (from weak acid CH3COOH)
2. ion formed from a strong acid will be neutral, eg Cl- (from strong acid HCl)
3. ion formed from a weak base will be a conjugate acid, eg NH4+ (from weak base NH3)
4. ion formed from a strong base will be neutral, eg Na+ (from strong base NaOH)
...2018-11-1804 minA Level Chemistry LessonsBronsted Acids and Bases: Types and StrengthAccording to Bronsted-Lowry theory of acids and bases,
- an acid is a proton, H3O+ or H+ donor
- a base is a proton, H3O+ or H+ acceptor
The strength of an acid or base is related to the extent of dissociation in solution:
- a strong acid or base is fully dissociated
- a weak acid or base is partially dissociated
So therefore we will have 4 possible types of acids and bases:
1. Weak Acid
2. Strong Acid
3. Weak Base2018-11-0204 minA Level Chemistry LessonsBalance Redox Reaction via Half Eqn MethodBalancing Redox Equations via the Half-Equation Method can be done via the following systematic steps.
1. Balance Redox Equation in Acidic Medium
Let's have this reaction as an example:
balance redox reaction using half equation method example
We can determine which species is oxidised and reduced by comparing the oxidation number:
- Oxidation state of manganese decreases from +7 to +4 hence MnO4- is reduced
- Oxidation state of iodine increases from -1 to 0 hence I- is oxidised
We can then write down the half equations for oxidation and...2018-11-0207 minA Level Chemistry LessonsCompare Strength of 2 Acids with different pHIf there are two acids, acid A at pH1 and acid B at pH3, which acid is the stronger acid?
strong acid vs weak acid question - pH1 versus pH3
You might be thinking acid A is the answer.
Since it has a lower pH, therefore there are more H+ in solution A.
So A must be the stronger acid.
It's obvious right?
Well... not really.
The truth is we cannot determine the strength of an acid just by looking at its pH alone.
2018-11-0103 minA Level Chemistry LessonsHow to draw Amino Acids and ProteinsLearn how to draw Alpha Amino Acids and Primary structure of Proteins by Maverick Puah the Chemistry Guru.2018-10-3109 minA Level Chemistry LessonsElectrophilic Addition Mechanism for AlkenesStep-by-step tutorial to learn how to draw the Electrophilic Addition Mechanism of Alkene by Maverick Puah the Chemistry Guru.
Do check out the following for more video lessons:
Organic Chemistry Videos
A Level Chemistry Videos
If you are looking for H2 Chemistry Tuition, do consider taking up my classes at Bishan.2018-10-3104 minA Level Chemistry LessonsHow to compare Basicity of Amines, Phenylamines and AmidesLearn how to compare Basicity for Amines, Phenylamines and Amides using Lewis Acid-Base Theory by Maverick Puah the Chemistry Guru
Do check out the following for more video lessons:
Organic Chemistry Videos
A Level Chemistry Videos
If you are looking for H2 Chemistry Tuition, do consider taking up my classes at Bishan.2018-10-2804 minA Level Chemistry LessonsSaytzeff Rule, Zaitsev Rule: How to predict Major Product for Elimination ReactionElimination Reaction for some alcohols and alkyl halides will result in different alkene products, and Saytzeff or Zaitsev Rule is used to determine the major product.
Listen to this podcast to learn how to apply Saytzeff Rule.
Maverick Puah is a top A Level Chemistry Tutor and YouTube Educator in Singapore. Check out his online video lessons. 2018-09-2105 minA Level Chemistry LessonsMarkovnikov Rule and Predicting Alkene Major ProductWhen an asymmetrical reactant such as HBr, HCl and H2O is added to an asymmetrical alkene, two possible products can be formed.
Listen to this podcast to learn how to predict the major product using Markovnikov Rule.
Maverick Puah is a top A Level Chemistry Tutor and YouTube Educator in Singapore. Find out more about his online chemistry lessons. 2018-09-2108 min