What are the different types of JC Chemistry tuition classes available at your centre?

We have 3 modes of learning for students to choose from: weekly physical classes at Bishan; weekly online lessons via Zoom; and on-demand video lessons.

Are you the only Chemistry tutor conducting the classes or do you engage other tutors to do that?

Please be rest assured that I conduct all my classes personally and I do not engage other tutors to teach at my centre.

How well do your students perform after attending your H2 Chemistry tuition classes?

Most of my students showed improvements by at least 3 grades and more than 80% have attained distinction for A Levels. The earlier the students join my classes, the more confident I am in improving their grades.

What is your class size at Bishan?

Usually the class size is around 10 to 12 students. Max class size is 16 pax.

Is there makeup lesson if I miss a class?

Yes makeup lesson is available in the same week subject to availability. If makeup class is not possible, the student can view the recorded video lessons at Google Classroom.

Do you have trial lesson available? How much is it?

Yes we do. Fees for trial lesson are for Bishan class and for Zoom online class.

Does your centre offer O Level chemistry tuition? Do you teach IB / IP chemistry tuition? How about H1 Chemistry?

Chemistry Guru specialises in H2 Chemistry for JC1 and JC2 or IP Year 5 and IP Year 6 students only. Find out all the information about A Level H2 Chemistry and the detailed comparison between H1 and H2 Chemistry. We do not conduct lessons for H1 Chemistry, O Level Chemistry, IB Chemistry or IP Chemistry at IP Year 3 and IP Year 4.

Strong Acid vs Weak Acid: Comparing Strength of 2 Acids with different pH values

If 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.

There are 2 instances where A is not the stronger acid.

1. Acid A is a weaker acid at higher concentration

Acid A can be a weak acid at a much higher concentration than Acid B which is a strong acid.

This means A can still dissociate to give more H⁺ in solution, hence its pH is lower.

strong acid vs weak acid scenario one - A is weak acid at higher concentration

2. Acids A and B are the same acid but acid A has a higher concentration

Now that we know that pH is dependent on concentration of the acid, we can also have the scenario that both acids A and B are the same strong acid, eg HCl.

If the concentration of acid A is higher, it will dissociate to give more H⁺ in solution, hence A will have a lower pH.

strong acid vs weak acid scenario 2 - same acid with different concentrations

Using pH alone to predict the strength of acids is a very common mistake among students for the topic of Ionic Equilibria.

Be sure to check this video out to clear this misconception once and for all!

Topic: Ionic Equilibria, Physical Chemistry, JC, H2, A Level Chemistry, Singapore

Back to other previous Physical Chemistry Video Lessons.

Found this A Level Chemistry video useful?

This free chemistry video lesson is brought to you by Chemistry Guru, Singapore's leading JC Chemistry tuition centre since 2010.

Please like this video and share it with your friends!

Join my 18,000 subscribers on my YouTube Channel for new A Level Chemistry video lessons every week.

Check out other A Level Chemistry Video Lessons here!

Need an experienced tutor to make Chemistry simpler for you?

Do consider signing up for my A Level H2 Chemistry Tuition classes at Bishan or online chemistry classes!

Menu

Classes

Info

Resources

Videos