Quantcast

A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

bowlinL7252

  • 2 years ago

Hi guys, one question with a couple of parts! What is the oxidation state for the atoms in the reaction: 2Al + 8H2O → 2H+1 + 3H2 + 2Al(OH)4-1 a) Elemental aluminum (Al) b) One hydrogen atom in H2O c) One oxygen atom in H20 d) Elemental hydrogen (H) e) One aluminum atom in Al(OH)4-1 f) One oxygen atom in Al(OH)4-1 g) One hydrogen atom in Al(OH)4-1

  • This Question is Closed
  1. aaronq
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    oxidation state on homonuclear molecules or elemental species = 0

  2. aaronq
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Oxygen = -2 always

  3. aaronq
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    you can figure out the rest by balancing the charges

  4. bowlinL7252
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Alright, so for a i got 0, b -3, c -2, d 1, e 2, f -2 and g 0. Are these right?

  5. Frostbite
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Let me see if I get this right: You suggest that hydrogen in water have the oxidation number -3?

  6. bowlinL7252
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I believe so

  7. Frostbite
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Okay. We need an additional rule: "The sum of oxidations numbers most equal to total charge of the molecule." So when we look at water it have no charge... sense oxygen always get -2 each hydrogen most be what?

  8. bowlinL7252
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    -5? And in that equation, which element was reduced and which was oxidized?

  9. bowlinL7252
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    And can verify my answers please?

  10. Frostbite
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Best you get some training, so I'm gonna start with water and we take them each by each. H2O we take notice: Total charge = 0 oxygen always -2 Hydrogen always +1 This also make sense we should say: 0=-2+2*x <-> x=+1

  11. Frostbite
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    aluminum is right. again it does not have charge and is an elemental species.

  12. bowlinL7252
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Both hydrogens are positive one as well?

  13. Frostbite
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Yes. it is 2 times +1

  14. bowlinL7252
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Alright, so what about for e through g?

  15. bowlinL7252
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    hello?

  16. Frostbite
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Sorry I was thinking. both e and g are wrong.

  17. Frostbite
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    The oxidation state of oxygen is -2 the oxidation state of hydrogen is +1: so we get: Al(OH)4 -1 -1 = -8+4+x Here is x the oxidation state of Al.. What is x?

  18. Frostbite
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Not quite.

  19. Frostbite
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[-1=-8+4+x\] \[x=-1+8-4=3\]

  20. bowlinL7252
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    So aluminum was reduced, so which was oxidized?

  21. aaronq
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    which one are you working on?

  22. bowlinL7252
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    g

  23. bowlinL7252
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I need the answer for g and then: In the equation above, which element was reduced and which element was oxidized?

  24. aaronq
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    The H on the compound is part of the hydroxide ion, which is OH^- since O is -2 and theres a -1 charge on ion, H is +1

  25. bowlinL7252
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Awesome. so then which was oxidized and which was reduced?

  26. aaronq
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    they're both 0 when not part of a molecule, if one gains e then we say its reduced because it became more negative, the opposite is for oxidized.

  27. bowlinL7252
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I mean for all of the elements in the equations, it seems like aluminum gained electrons

  28. bowlinL7252
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    !

  29. aaronq
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    we already did everything in the equation

  30. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.