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Brixx
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mystery substance

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I have a piece of equipment that has the following liquid chemicals CH₃COOH + HF + HNO3 they were leaking onto a pump with an aluminum body. the end result is a white crystalline substance that is bonded to the cabinet. the cabinet is constructed from PFA. this stuff is bonded so well that I have to use a chisel to remove it. can anyone tell me what this stuff is?
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ChenBeier
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Re: mystery substance

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Very strong chemical mixture. It will be an mixture of aluminiumoxide and -flouride.
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Dhamnekar Winod
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Re: mystery substance

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What is the equation and type of this chemical reaction?
Last edited by Dhamnekar Winod on Thu Apr 15, 2021 4:43 am, edited 1 time in total.
Any science consists of the following process. 1) See 2)Hear 3)Smell,if needed 4)Taste, if needed 5)Think 6)Understand 7)Inference 8)Take decision [Believe or disbelieve, useful or useless, true or false, cause or effect, any other criteria]
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ChenBeier
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Re: mystery substance

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Oxidation of Aluminium, will create Aluminium oxide by nitric acid and Aluminium flouride by hydrogen flouride, Aluminium acetate is minor from acetic acid.
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Dhamnekar Winod
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Re: mystery substance

Post by Dhamnekar Winod »

Is the balanced chemical equation for the above chemical reaction correct?

3 HF + 2 HNO3 + 3 CH3COOH + 6Al → 2 Al2O3 + AlF3 + AlC6H9O6 + 4 H2 + N2
Any science consists of the following process. 1) See 2)Hear 3)Smell,if needed 4)Taste, if needed 5)Think 6)Understand 7)Inference 8)Take decision [Believe or disbelieve, useful or useless, true or false, cause or effect, any other criteria]
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ChenBeier
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Re: mystery substance

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NO. Dont use the solver without knowledge what is going on.

The main reaction is the redox reaction Al and HNO3

HNO3 + 3 H+ + 3e- => NO + 2 H2O Reduction

2 Al + 3 H2O => Al2O3 + 6 H+ + 6 e- Oxidation

2 Al + 2 HNO3 => Al2O3 + 2 NO + H2O summery

The oxid is able to react with HF or CH3COOH.
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Dhamnekar Winod
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Re: mystery substance

Post by Dhamnekar Winod »

Thanks for your correct answer.
Any science consists of the following process. 1) See 2)Hear 3)Smell,if needed 4)Taste, if needed 5)Think 6)Understand 7)Inference 8)Take decision [Believe or disbelieve, useful or useless, true or false, cause or effect, any other criteria]
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