Kev soj ntsuam ceev ceev ntawm zinc hauv manganese tooj dag
Thaum ntsuas zinc hauv manganese tooj dag, thaum cov ntsiab lus manganese me me, Mn (l) tuaj yeem oxidized rau hauv insoluble hydrated manganese dioxide nyob rau hauv ib qho ammoniacal nruab nrab siv kub persulfate raws li cov oxidant thiab sib cais, thiab cov zinc tuaj yeem ntsuas. ; Thaum cov ntsiab lus manganese siab, xws li ZHMn57-3-L, thaum cov ntsiab lus manganese siab dua 2%, cov ntaub ntawv hais tias potassium chlorate lossis persulfuric acid yuav tsum tau siv los ua cov oxidant hauv nitric acid nruab nrab. Ua li no, hydrated dioxide kuj tuaj yeem tau Manganese cais los ntawm manganese, tab sis kev sib cais manganese tsis tiav. Nyob rau lub hauv paus no, daim ntawv no tau ua ib qho nruab nrab ntawm nitric acid, poov tshuaj chlorate ntau npaum, lub sij hawm cua sov, thiab daim npog qhov ncauj ntawm kev cuam tshuam ions tom qab sib cais. Qhov kev sim tau pom tias txhawm rau txhawm rau ua kom tiav nag lossis daus ntawm hydrated manganese dioxide, xav tau cov nitric acid, thiab dilute nitric acid yuav tsum tsis txhob siv. Potassium chlorate yog siv rau kev sib cais. Cov lim dej tom qab siv persulfuric acid tau raug sim thiab pom tias muaj manganese tsawg heev. Cov lim dej tau npog nrog cov poov tshuaj fluoride, sulfide, barium chloride, thiab lwm yam, thiab nyob rau hauv acidity ntawm pH ~ 5.5, nws tau kho nrog xylenol txiv kab ntxwv, olfactory Cresol ntsuab yog ib qho kev qhia sib xyaw. EDTA yog siv rau kev titration nyuaj. Txoj kev no yooj yim rau kev khiav lag luam. Qhov tseeb ntawm qhov kev ntsuam xyuas tau ua tau raws li qhov yuav tsum tau ua thiab tuaj yeem siv los txiav txim siab zinc hauv nickel-dawb manganese tooj dag.
1. Reagents thiab cov cuab yeej siv
Barium chloride kua: 109 · L-'
Sodium sulfate thiab sulfonate kua: ob leeg yog 1. Bao·Lyi'
Hexamethylenetetramine: 3009 · IJ-'
Methyl txiv kab ntxwv, xylenol txiv kab ntxwv: ob leeg yog g2·1zhouyi`
Ocresol ntsuab: 29·IJ-' (npaj nrog ethanol)
EDTA txuj kev daws teeb meem: 0.olm
2.Txoj kev tsom xam
Qhov hnyav {{0}}.50009 ntawm cov qauv rau hauv 200ml lub caj dab siab. Ntxiv 15 ml ntawm concentrated nitric acid. Tom qab cov qauv yog yaj tag, cua sov kom tshem tawm cov nitrogen oxides. Tshem tawm thiab txias me ntsis. Ntxiv 0.59 ntawm poov tshuaj chlorate. Boil rau Zmin. Ntxiv dej rau li 150 ml. Lim. Hauv 250ml ntsuas lub hwj, dilute nrog dej rau lub cim. Siv 25ml ntawm daim duab peb sab beaker qhuav, ntxiv 25ml dej, 1ml ntawm barium chloride, 10ml ntawm sodium sulfate, 29ml ntawm poov tshuaj fluoride, 10ml ntawm sulfur, thiab ntxiv ib tee ntawm methyl txiv kab ntxwv qhia. Kho nrog hexamethylenetetramine kom txog thaum cov xim liab ntawm cov tshuaj tsuas yog ploj mus. Thiab overdose 10 ml. Ntxiv 3 tee ntawm Ocresol Green qhia thiab 5 tee ntawm Xylenol Txiv kab ntxwv. Titrate nrog 0.olmol·I-EDTA tus qauv tov kom txog thaum cov tshuaj tsuas yog hloov nyom ntsuab raws li qhov kawg taw tes, thiab siv cov qauv zinc cov ntsiab lus zoo sib xws los hloov cov txiaj ntsig ntawm cov qauv.
3. Kev xaiv cov kev xeem
(l) Acidity can be seen from the acid effect curve. When titrating zinc with EDTA standard solution, the required pH is >4. The xylenol orange indicator is purple when pH >6.1 thiab daj thaum pH'6.1. Lub complex tsim los ntawm xylenol txiv kab ntxwv thiab cov hlau ion zinc yog liab. Yog li ntawd, lub acidity ntawm cov tshuaj yuav tsum tau xaiv nyob rau hauv cov xwm txheej ntawm 4
(2) Kev cuam tshuam ntawm kev noj cov tshuaj poov tshuaj chlorate thiab kev sib tsoo cov kua qaub yog cais cov manganese kom tiav. Concentrated nitric acid yuav tsum tau siv. Nws tsis tsim nyog siv dilute nitric acid. Thiab qhov ntau npaum ntawm nitric acid yuav tsum tsis txhob loj dhau.
Tsawg dua. Tsis tas li ntawd, tom qab ntxiv cov poov tshuaj chlorate, nws pom tias cov tshuaj yog txaws tawm thiab kev sib cais ntawm manganese tsis tiav. Tom qab kuaj, siv 15 ml ntawm cov concentrated nitric acid thiab potassium chlorate. () 59.
(3) Txhawm rau tshem tawm cov ions cuam tshuam, barium chloride ntau dua 10 npaug ntawm cov ntsiab lus txhuas tuaj yeem siv los ua cov hlau lead sulfate nrog sodium sulfate rau cov hmoov txhuas hauv cov tooj liab qhuav.
Barium sib xyaw siv lead ua precipitates, thiab cov precipitate no soluble ntau dua li cov hlau lead sulfate. Cov tin qhuav, hlau, thiab txhuas tuaj yeem npog nrog cov tshuaj fluoride. Thaum cov hlau thiab txhuas cov ntsiab lus ntau dua 10, 000, 509·L acetone tuaj yeem siv rau daim npog qhov ncauj. Tooj liab tuaj yeem npog nrog cov leeg sulfur.
(4) Kev xaiv ntawm qhov taw qhia Thaum xylenol txiv kab ntxwv siv los ua qhov taw qhia, nws tsis yooj yim rau titrate qhov kawg ntawm cov tshuaj los ntawm liab mus rau daj thaum titrating nrog EDTA standard tov.
Nws yog ib qho yooj yim los soj ntsuam. Tshwj xeeb tshaj yog thaum cov hlau lead thiab barium sulfate precipitates nyob rau hauv cov tshuaj titration, qhov kawg point tsis tuaj yeem pom. Vim li no, Ocresol Green qhia tau xaiv los qhia cov yam ntxwv ntawm ntsuab hauv pH - 5.5, thiab xylenol txiv kab ntxwv thiab Ocresol yog siv. Rau qhov ntsuas ntsuab sib xyaw, thaum lub titration mus txog qhov kawg taw tes, muaj cov txheej txheem dhia pom tseeb. Ntawd yog, kev daws teeb meem hloov pauv ntawm ntshav-liab mus rau nyom ntsuab, thiab qhov kawg taw tes yog pom tseeb dua.
