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Homework Help: Hcn + Hf -> ?

  1. Jan 31, 2008 #1
    Hcn + Hf --> ?

    1. The problem statement, all variables and given/known data

    -What do HCN + HF form? (I've googled the reaction, can't find anything).
    -Also, what're 3 good characteristics of an acid-base indicator?

    2. Relevant equations

    3. The attempt at a solution

    I know it's an acid-base reaction. I'm guessin something like
    HCN + HF --> NH3 + CF

    -One good characteristic of an acid base indicator would be an intense colour change?
    Last edited: Jan 31, 2008
  2. jcsd
  3. Jan 31, 2008 #2


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    HCN has localized electrons available on the nitrogen and the proton (on carbon) is fairly acidic. This suggests that it should hydrogen bond fairly easily... but is the hydrogen in HF that available for hydrogen bonding?
    Fluorine has a strong affinity for hydrogen... but is it strong enough to deprotonate the hydrocyanic acid?
  4. Jan 31, 2008 #3
    so I'm guessing then that there isn't a reaction? because judging from what you said, the only thing I can think of is:

    HCN + HF ------> HCF3 + NH3
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