Al(OH)3 muab cov tuab, dawb, gelatinous precipitate ntawm aluminium hydroxide. Raws li ntau sulfuric acid ntxiv, lub precipitate ntawm Al (OH) 3 dissolves rau daim ntawv soluble Al3+ ions. Thaum kawg, cov crystals ntawm alum raug tshem tawm los ntawm kev daws los ntawm lub tshuab nqus tsev pom thiab ntxuav nrog cawv / dej sib tov.
Dab tsi yog kev sib txuas ntawm alum?
Nyob rau hauv qhov kev sim no, koj yuav tsim ib hom alum hu ua potassium aluminium sulfate dodecahydrate, KAl(SO4)2 •12H 2 O. Koj yuav ua kom cov khoom sib xyaw no los ntawm kev tso cov ions tsim nyog rau hauv ib lub thawv hauv cov kua dej thiab tom qab ntawd evaporate cov dej los tsim cov alum crystals.
Cov roj hluav taws xob dab tsi yog tsim los ntawm kev sib txuas ntawm alum los ntawm Al thiab KOH?
Thaum nws yog xim hlau txhuas los rau hauv kev sib cuag nrog cov dej daws ntawm cov hauv paus muaj zog xws li potassium hydroxide, KOH, nws reacts rau daim ntawvhydrogen gas(FLAMMABLE!) thiab ntsev uas muaj txhuas thiab poov tshuaj ions. reacts rau daim ntawv txhuas hydroxide, Al (OH), thiab potassium sulfate, K SO.
Yuav ua li cas yog tias K + muaj nyob rau hauv cov qauv ntawm alum?
Potassium yog volatilized ntawm qhov kub siab heev ntawm nplaim taws (kwv yees li 1000 ° C) ntawm qhov taw tes nws muab cov xim xiav-ntsuab rau nplaim taws. Tom qab ob peb feeb hauv nplaim taws, sulfur dioxide yuav raug tshem tawm ntawm koj.cov qauv alum, thiab cov khoom siv uas tseem tshuav yuav suav nrog txhuas oxides.
Puas yog alum a precipitate?
Alums tuaj yeem yooj yim tsim los ntawm nag lossis daus los ntawm cov tshuaj aqueous. Hauv kev tsim cov poov tshuaj alum, piv txwv li, aluminium sulfate thiab poov tshuaj sulfate yog yaj hauv dej, thiab tom qab evaporation cov alum crystallizes tawm ntawm cov tshuaj. … Feem ntau alums muaj astringent thiab acid saj.
