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31 responses
Hi,
How can I access the free tutoring? Where can I access the free videos? Is there any link?
Thanks!
Hi Hana,
It’s nice to see you here again.
Our next free lessons will be on June 9 to 30. You visit any of the free lessons pages, and you will see the notes and videos when they are live.
In the meantime, make sure to vote for the topic that you want us to cover.
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Hello!
(With reference to Paper 33, October/November, 2011, Question 3dii)
Kindly explain to me why we cannot consider oxidizing/reducing agents, and instead have to consider bases/acids as per the marking scheme.
Thank you
Hi there,
Thank you for your message.
The free Chemistry lesson is on March 22 – 28.
We will be glad to include this topic, Oxidation and Reduction, as one of the topics for voting.
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Thank you so much!
Hi there,
Reducing/oxidizing agents are present in redox reactions. There are two easy ways to establish whether oxidation/reducing processes took place in a chemical reaction:
– a gain of oxygen (oxidation) by an element and loss of oxygen (reduction)
– electron transfer and changes in oxidation number are present
In the reaction presented between phosphate ion and sulfuric acid, none of the reagents gains/loses oxygen. Therefore, it is NOT a redox reaction and the reagents cannot be classified into reducing/oxidizing agents.
According to the Brønsted–Lowry theory of acids and bases, a BASE is a PROTON ACCEPTOR. In the case of Question 3dii, the phosphate ion ACCEPTS two PROTONS leading to a dihydrogen phosphate ion.
We hope this helps. If you require any guidance, please do not hesitate to contact us.
Best Regards,
Chemistry Department
Thank you so much for your help.
Hi,
We are happy to help. We hope to see you at our next free lessons.