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Thread: Ferrocyanide when HCl is added in basic conditions

  1. #1 Ferrocyanide when HCl is added in basic conditions 
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    does ferrocyanide react to form HCN when HCL is added to the solution? The pH is extremely caustic, it never reaches lower than pH 9.

    Also is ferrocyanide nutralised by Sodium Hypochlorite?


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    KJW
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    According to Wikipedia, both ferrocyanide and ferricyanide form HCN upon treatment with strong acid. However, both compounds are stable within the body and have low toxicity.

    It is my estimate that ferrocyanide is oxidised to ferricyanide by hypochlorite.


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  4. #3  
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    Yes, however ferrocyanide and ferricyanide are extremely strong complexes, there is large amounts of NaOH in the solution as well as water, so would the H+ attack those before attacking the Ferrous complexes. Like I said the solution even after HCl introduction never reaches less than pH of 9. I think wiki says that ferrocyanide only decomposed to HCN is acidic conditions. I want to make sure before I run any tests though.

    Even though the two complexes are not toxic we are not allowed to put it down the drain as the pH is way too high. the pH needs to be brought down to 10 before we can release it into the drains.

    Also the amount of ferrouscyanide is extremely low <<1ppm
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  5. #4  
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    Quote Originally Posted by james2409 View Post
    does ferrocyanide react to form HCN when HCL is added to the solution? The pH is extremely caustic, it never reaches lower than pH 9.

    Also is ferrocyanide nutralised by Sodium Hypochlorite?
    According to one of my chemistry textbooks (Lowry and Cavell), "if hydrochloric acid is added to potassium ferrocyanide, hydroferrocyanic acid is set free and can be precipitated from the solution by the addition of ether. This acid crystallizes in colourless scales which are quite stable in dry air but turn blue in moist air owing to oxidation, probably to Prussian blue."

    If there is excess caustic around, however, I would be fairly certain that it would be the first thing to react when HCl is added.

    I concur with KJW about the oxidation.
    Last edited by Warron; September 2nd, 2014 at 02:44 PM.
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