Which pungent odor does sodium fluoride usually emit?
比如大蒜的味道？味道浓吗？如果天气炎热，气温超过30度，味道会不会更明显？谢谢
Reply 1
Sodium fluoride is non-volatile and so is odourless.
You may be thinking of hydrogen fluoride, which is described as having a sharp, irritating odour. Having never smelt it myself (which is something I hopefully never will do), I can’t really give you a better description.
You may be thinking of hydrogen fluoride, which is described as having a sharp, irritating odour. Having never smelt it myself (which is something I hopefully never will do), I can’t really give you a better description.
Reply 2
Sodium fluoride (NaF) does not smell in solid form. Exposition to moisture or Contact with acids can release hazardous hydrogen fluoride (HF) fumes.
Caution: The salt (NaF) has a very pungent, distinctive odour under the above condition and may irritate the eyes, nose and throat. If you’re exposed to it for a long time or inhale it, it can cause discomfort, coughing, or interference with your breathing. Take precautions to minimize your exposure and avoid inhaling the fumes.
Bye,
Sandro
Caution: The salt (NaF) has a very pungent, distinctive odour under the above condition and may irritate the eyes, nose and throat. If you’re exposed to it for a long time or inhale it, it can cause discomfort, coughing, or interference with your breathing. Take precautions to minimize your exposure and avoid inhaling the fumes.
Bye,
Sandro
(edited 1 month ago)
Original post by Nitrotoluene
Sodium fluoride (NaF) does not smell in solid form. Exposition to moisture or contact with acids can release hazardous hydrogen fluoride (HF) fumes.
Caution: The salt (NaF) has a very pungent, distinctive odour under the above conditions and may irritate the eyes, nose and throat. If you’re exposed to it for a long time or inhale it, it can cause discomfort, coughing, or interference with your breathing. Take precautions to minimize your exposure and avoid inhaling the fumes.
Bye,
Sandro
Caution: The salt (NaF) has a very pungent, distinctive odour under the above conditions and may irritate the eyes, nose and throat. If you’re exposed to it for a long time or inhale it, it can cause discomfort, coughing, or interference with your breathing. Take precautions to minimize your exposure and avoid inhaling the fumes.
Bye,
Sandro
With acid it could form HF, but simply with moisture? Are you sure? Do you have a source?
Reply 4
Original post by Pigster
With acid it could form HF, but simply with moisture? Are you sure? Do you have a source?
NaF does not react with water - at least not to a perceptible extent. It would be extremely unintuitive for it to do so in terms of the presumable products formed (NaOH and HF, which surely would react) and the pKas of HF and H2O as H2O (pKa = 14) is a much weaker acid than HF (pKa ≈ 3), so the best you’ll get is an extremely unfavourable equilibrium with an equilibrium constant circa 10^-11.
On the topic of pKas, you do also have to consider them when deciding which acids can react with NaF to give HF. As above, any acids weaker than HF would either not react or would establish unfavourable equilibria.
Reply 5
You're both right, I made a mistake, in fact not all fluorides react in this way - ionic fluorides (e.g. NaF, CaF2) are stable in water.
I apologise for the error and will correct my text above immediately.
Bye,
Sandro
I apologise for the error and will correct my text above immediately.
Bye,
Sandro
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