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1、阳离子分析实验的经验（Experienceincationicanalysis）PotassiumionIngeneral,sodiumhexonitrocobalatewasusedforthedeterminationofneutralandmicroacidicconditionstopreventthedecompositionofsodiumhexitrocobalate.Whentherootofammoniumispresent,itwillbeinterferedbythestandardandmaynotbeobservedinpractice.
2、Potassiumandtartaricacidcanbeformedprecipitateandtheprecipitationsolubilityissmall,potassiumtartrateisoneofthefewinsolublepotassiumsalt,butnotsuitableforidentification.Becauseitiseasytoproducesolubleacidsalt,potassiumtartrateinhotwatercandissolve,diluteacidandalkalicandissolvepotassiu
3、msalt,theactualphenomenonisnotobvious.Andthedahualaboratorygenerallydoesnotprovidetartaricacid.Ifthefirststepisnotdetectedinthefirststep,thepotassiumioncanbetestedbyasingledroptest,whichcaneffectivelypreventtheleakdetectionSecond,theammoniumrootIngeneral,thegaschambermethodisusedinthe
4、system.Aftertheadditionofammoniatothesystem,itisnecessarytoverifytherootofammonium.Ammoniaishighlyvolatileinhotweatherconditions.Tip1:smallpetridishestogetherwithbigpetridishestoreagent,add3dropsrapidlyafter6mnaohcoverthesurfaceofsmalldish,otherwisetheammoniavolatilizationrapidlyfromt
5、hetesters,withoutred,onthewaterbathheatingtwominutes,ifhaveammonium,phenolphthaleintestpapershouldbetobecomered.Ifthesmallsurfaceofthedishisremoved,thephenolphthaleintestpaperwillfadequicklyduetothepresenceofcarbondioxideintheair.Tip2:fortheproductionofphenolphthaleintestpaper,thestri
6、pofpaperistoolong.Itshouldbetorntotwo,abouthalfacentimeter,andthephenolphthaleindropstwodropsonbothends,toolittletobeglued,toomuchtofalloff.Usenailtipstokeepitfixed.Whencoveringthesmallsurfaceoftheplate,theactionshouldbelight,preventingthetestpaperfromfallingintocontactwiththereagent.
7、Tip3:thesummertemperatureishigh,ammoniavolatilizationquickly,thefirsttimeundetectedammoniumroot,theproposalistestedtwicejustincase.Tip4:whencheckingoutsystemcontainsfourtin,buthavenotfoundammoniumion,itisnecessarytoadd5~6dropsofconcentratedsodiumhydroxideammoniumre-examinedtheroot,the
8、reaso
