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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: thaqrhys on November 27, 2007, 11:48:06 PM

Title: Hydrofluoric Acid Purification
Post by: thaqrhys on November 27, 2007, 11:48:06 PM

Hello everyone,

How can I purify Hydrofluoric Acid 55 % in order to get Anhydrous HF ?

Thanks before.

Title: Re: Hydrofluoric Acid Purification
Post by: agrobert on November 27, 2007, 11:55:38 PM

Call Honeywell.

Title: Re: Hydrofluoric Acid Purification
Post by: thaqrhys on November 28, 2007, 12:01:39 AM

Thanks for the advice.

Is there any other way that i could do it on my own ?

I only need it in small amount, say a liter or two.

Title: Re: Hydrofluoric Acid Purification
Post by: thaqrhys on November 28, 2007, 10:03:28 PM

Quote from: agrobert on November 27, 2007, 11:55:38 PM

Call Honeywell.

My position is in Indonesia. I've emailed Honeywell, but still no answer.

Does anyone in here have some experiences in purifying acid ( H2SO4 or HCl or others )?
Maybe I could apply the similar techniques for purifying HF.

Title: Re: Hydrofluoric Acid Purification
Post by: lemonoman on November 28, 2007, 10:43:51 PM

Question for other people, which might contribute and might not:

Could you electrolyse the water at a potential difference of 0.4 V to turn the water into H2 and O2, while keeping the HF?

Given:

F_2(g) + 2e^- --> 2 F^-_(aq)        E⁰ = +2.87 V
2 H⁺_(aq) + 2e^- --> H_2(g)       E⁰ = 0.00 V

Title: Re: Hydrofluoric Acid Purification
Post by: thaqrhys on November 30, 2007, 03:43:24 AM

I'm afraid it couldn't be happen.

Since HF is a weak acid, instead water ionizes, we will get H2 and F2. CMIIW

thanks so much anyway for your advice.