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One of the following undergoes a reaction

  1. Oct 21, 2008 #1
    1. The problem statement, all variables and given/known data

    One of the two pairs of reactants will undergo a reaction. Which one, and what are the products?

    Co(OH)2 (s) + NaOH (aq) ---->

    Al(OH)3 (s) + NaOH (aq) ----->

    2. Relevant equations

    N/a

    3. The attempt at a solution

    I thought it might have something to do with the reactivity series, but I'm not sure how to proceed.
     
  2. jcsd
  3. Oct 21, 2008 #2

    Borek

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    Staff: Mentor

    Amphoterism is a key word here.
     
  4. Oct 21, 2008 #3
    So one of the metal hydroxides can act as a base and an acid?
     
  5. Oct 22, 2008 #4

    Borek

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    Staff: Mentor

    Yes.
     
  6. Oct 22, 2008 #5
    So is the reaction a neutralization reaction?
     
  7. Oct 22, 2008 #6

    Borek

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    Staff: Mentor

    Can be treated this way. Check wiki article on aluminum hydroxide to find out products of the reaction.
     
  8. Oct 26, 2008 #7
    Okay, according to wikipedia, Al(OH)3 will form Al(OH)4-. So would the other product be Na+? Also, how do we know this reaction takes place and the one with Co(OH)2 doesn't?
     
  9. Oct 26, 2008 #8

    Borek

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    Staff: Mentor

    Yes.

    You have to learn properties of the elements.
     
  10. Oct 26, 2008 #9
    So because Al is higher on the reactivity series than Co, the Al reaction will take place? Wait, but Na is higher than both of them. So they wouldn't be able to replace it anyway?
     
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