英语翻译Method of Perchloric - 已解决

英语翻译Method of Perchloric acid measuringA.Collocate Perchlori

英语翻译

Method of Perchloric acid measuring

A.Collocate Perchloric acid Glacial acetic acid solution:Extract 8.5ml perchloric acid,immit 500ml glacial acetic acid and 20ml acetic anhydride while keep whisking.Then immit 470ml glacial acetic acid and shake up the mixture.

demarcate:

Take0.2000g (drying at 105℃ for two hours) Potassium hydrogen phthalate,standard solution and put it in a dry wikipedia,dissolve 20ml Glacial acetic acid in it while keep the solution tepid,then titrate with 4-5 points of 0.2% crystal purple glacial acetic acid solution until the color of the solution turn to blue.

B.The content of the choline chloride powder measuring:

Take 0.2gs (the weight should be accurate to 0.0002gs) sample in invariable weight and put it in a 250ml wikipedia.Immit 40ml methyl alcohol,waggle sufficiently for 30 minutes and filtrate the mixture.Then wash and deposit three times with 20ml,15ml,15ml methyl alcohol,mix the filtrate and filtrate it,dry it to desiccated in sciequip.After drying,immit 20ml Glacial acetic acid and heating to dissolve it.Then add 2ml acetic anhydride,10ml Mercuric Acetate,two point crystal purple indicator and shake up.Titrate with 0.1N perchloric acid until the solution is pure blue.Emendate the result with blank experiment.

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Perchloric acid measurement:

One:Preparation of perchloric acid-glacial acetic acid solution:

Poured 8.5 ml perchloric acid into 500ml glacial acetic acid and 20ml acetic anhydride combined solution under agitation,then added 470ml glacial acetic acid and agitated.

Determination:

Placed 0.2000 g potassium hydrogen phthalate (dried for 2 hours at 105℃) in a dry erlenmeyer and added 20ml glacial acetic acid under warm temperature,and titrated by addition of 4-5 droplets 0.2% crystal violet to change the color of the solution from purple to blue.

Two:measurement of choline chloride content in the dust:

Placed 0.7g (weighed to 0.002g) absolute-dried sample and 40ml methanol in a 250ml erlenmeyer and agitated for 30 minutes firstly,secondly filtrated,thirdly washed the sediment three times with 20 ml,15 ml,and 15 ml methanol,respectively,fourthly combined the filtrates for further filtration,fifthly vapourized to dry under water-bath and ready for use.After vapourization,solved the residue in 20ml glacial acetic acid under heating,then 2 ml acetic anhydride,10ml mercuric acetate,and 2 droplets of crystal violet indicator were added under agitation,titrated with 0.1N perchloric acid standard solution until the solution showed pure blue,meawhile,the result was corrected with blank test.

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