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# Hard buffer question

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1. Attachment 517009517011Can anyone help with this hard OCR buffer question?
Attached Images

2. Seriously need help please !!
3. whats the final pH that the mark scheme gives for part b?
4. (Original post by AqsaMx)
Attachment 517009517011Can anyone help with this hard OCR buffer question?
Could you give year/month/syllabus for this one please?
5. (Original post by AqsaMx)
Attachment 517009517011Can anyone help with this hard OCR buffer question?
more a stoichiometry question ...
6. (Original post by ayvaak)
whats the final pH that the mark scheme gives for part b?
It can't have got more acidic!!!

7. (Original post by charco)
It can't have got more acidic!!!

8. (Original post by AqsaMx)
What do you not understand? You have written the correct equation and answer on your work that you posted.
9. (Original post by TeachChemistry)
What do you not understand? You have written the correct equation and answer on your work that you posted.
If the ratio between the metal, weak acid and salt is all 1 : 1 : 1 why then do we times the moles of magnesium by 2?
10. (Original post by ayvaak)
If the ratio between the metal, weak acid and salt is all 1 : 1 : 1 why then do we times the moles of magnesium by 2?
because 1 mole of magnesium reacts with 2 of acid
11. (Original post by charco)
because 1 mole of magnesium reacts with 2 of acid
Oh i see. Thanks
12. the persons working out is atrocious can someone please do some detailed working please ( write the new Ka equation and write steps to get the answer)
13. (Original post by Sniperdon227)
the persons working out is atrocious can someone please do some detailed working please ( write the new Ka equation and write steps to get the answer)
Why don't you post a lovely, tidy piece of work for us to look at?
14. (Original post by Sniperdon227)
the persons working out is atrocious can someone please do some detailed working please ( write the new Ka equation and write steps to get the answer)
Hahaaaaa, i wonder how lovely your working out is in exams
15. (Original post by AqsaMx)
Hahaaaaa, i wonder how lovely your working out is in exams
16. Attachment 537535I am currently stuck on question 5 of the photo. I was hoping someone could help. The answers C but i cant work out why. Thanks in advance.
17. I assume it's because a transition metal loses its first electron from a 4s^2 orbital and the second IE seems to be the biggest jump as there would only be one electron left in the 4s orbital so lot less energy to remove since the weakest attraction to nucleus since highest energy outer electron. I'm not sure though..

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