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Why do we use only sulfuric acid for permanganate titrations?

Mr Khemistry

Permanganate titration

Qn: Why can’t we use hydrochloric acid or nitric acid for manganate (VII) redox titrations?

Ans: For HCl, the chloride ion will be oxidised to chlorine gas by manganate (VII) ion.

HNO3 is also an oxidising agent and hence would compete with permanganate.

Lastly, permanganate cannot oxidize sulfate ion and sulfuric acid is not an oxidizing agent.

Therefore, sulfuric acid is the mineral acid of choice for manganate (VII) titrations.

More common questions here.

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June Intensive Revision Programme

Mr Khemistry

J2 students, need some last minute help in Organic Chemistry before your Mid-Year Exams?

Sign up for 4 lessons of intensive revision using 2016 Prelim structured questions from different JCs! Part 1 of our revision program covers the whole spectrum of organic concepts so do come prepared 🙂 Answers will be analysed together and misconceptions will be addressed on the spot.

Dates: 7, 9, 14, 16 June
Time: 2 – 5 pm
Venue: Bukit Timah Shopping Centre unit B2-13C

MCQ and Data-based organic questions will be covered under part 2 of our revision programme.

Dates: 21 and 23 June
Time: 2 – 5 pm
Venue: Bukit Timah Shopping Centre unit B2-13C

J1 students, stressed by your first JC major exam?

Sign up for our J1 revision program covering the core topics, Mole Concept, Gases, Chemical Bonding, Atomic Structure and Redox.

Dates: 5, 12, 19 June
Time: 10 – 1 pm
Venue: Bukit Timah Shopping Centre unit B2-13C

Contact us at enquiry@mrkhemistry.com or SMS/whatsapp us at 98537960 to register for your place today!

ps: Remember to bring along a sweater, it can get cold 🙂

3 Tips For Understanding Chemistry

Mr Khemistry

Tips for Studying Chemistry

Let’s face it, chemistry is not the easiest subject to master. It’s abstract concepts (think atoms and molecules) which you can’t see with your eyes. So here i will share with you all 3 tips for studying chemistry.

Tip

#1: Search for Youtube videos to help you visualize spatial ideas such as atomic orbitals or shape of molecules.

#2: Ask your teacher if there’s any suitable analogies to help you understand the concept e.g. making Subway sandwich for understanding rate-determing step

#3: Play with physical models such as those by Molymod, we happen to have a set here at Khemistry so do drop by if you want use it 🙂

All the best for your Chemistry and click here for more tips!

Remember, CHEMISTRY!
Mr Khemistry

More tips here!

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New! 2017 Time-table

Mr Khemistry

Bukit Timah Shopping Centre

Class Timings:

JC 2: Saturday, 230 – 430 pm

JC 1: Sunday, 2 – 4 pm 

Register for your slot today!

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