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thaidinh
Posts
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 Posted - 03/18/2003 : 19:37:48  
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Cac ban lam on chi minh cach phan biet cac chat sau voi(tung chat mot nhe)
Na;Cl;Fe;Mg;Ca;Al |
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salem85
27 Posts
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Posted - 03/19/2003 : 12:57:31
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Cl2 la chat khi mau vang
Na, Ca tan trong nuoc giai phong H2, suc CO2 qua 2 dung dich neu thay co ket tua => Ca
Al tan trong xut giai phong H2
Con lai Mg, Fe cho tac dung voi HCl roi cho tac dung voi dd kiem neu thay co ket tua trang => Mg(OH)2, neu co ket tua xanh reu =>Fe(OH)2
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prince18th
Vietnam
221 Posts
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Posted - 03/20/2003 : 13:27:58    
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ku Salem giải như c� ho� của Kent � ..
__________
A.X Puskin - Nguyễn Đức Ho�ng
[Prince18th@yahoo.co.uk]
[http://chatterbuddy.2ya.com]
[http://vnhacher.org]
[Http://panvietnam.com/unikey.exe]
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shang
Vietnam
26 Posts
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Posted - 03/20/2003 : 19:39:51
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neu' nhu de` bai` la` tach rieng tung` chat trong hon~ hop thi`??????????????
THIEU GIA HO NGUYEN TEN HAI |
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tutuyetphong
Vietnam
8 Posts
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Posted - 03/21/2003 : 17:45:07
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Cho tat ca vao nuoc va dun can than thi doc clo bay len. Ca, Na nam lai trong dung dich la hydroxit, con Al tac dung voi kiem cung tan luon. Cho them Na du de Al tan het. Co ket tua la Mg,Fe.
+ cho Hcl vao dung dich vua du thi duoc Al(OH)3 ket tua. Loc roi dun roi dien phan nong chay duoc Al. Con NaCl, CaCl thi cho tac dung Na2CO3, duoc ket tua da voi, cho tac dung HCl, dien phan thi duco Ca.
Con dung dichvan co Na+, cho tac dung Hcl de het Na2Co3, chi con NaCl thi dien phan
+ Tach chat ran Mg, Fe thi de roi
Vay minh lam co dung khong moi nguoi oi? |
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jamepotter5
Posts
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Posted - 03/28/2003 : 17:58:57
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tr�ch:
Cho tat ca vao nuoc va dun can than thi doc clo bay len. Ca, Na nam lai trong dung dich la hydroxit, con Al tac dung voi kiem cung tan luon. Cho them Na du de Al tan het. Co ket tua la Mg,Fe.
+ cho Hcl vao dung dich vua du thi duoc Al(OH)3 ket tua. Loc roi dun roi dien phan nong chay duoc Al. Con NaCl, CaCl thi cho tac dung Na2CO3, duoc ket tua da voi, cho tac dung HCl, dien phan thi duco Ca.
Con dung dichvan co Na+, cho tac dung Hcl de het Na2Co3, chi con NaCl thi dien phan
+ Tach chat ran Mg, Fe thi de roi
Vay minh lam co dung khong moi nguoi oi?
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jamepotter5
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Posted - 03/28/2003 : 18:20:16
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Dau tien cho to xin loi vi "sao" lai bai cua tutuyetphong,to khong co y chi tai khong ranh nen bam sai,mong moi nguoi nhuoi thong cam.bay gio to dinh chinh nghen:
khi cho hon hop cac chat do vao H2O (cac kim loai thi khong sao nhung rieng Cl:
Cl + H2O = HCl +HClO
HClO=HCl + [O]
nhu vay khi ban dun len thi du can than den dau khi bay len van la HCl va O2.tuy nhien ban van co the dun len de tach HClvaO2 ,roi tien hanh cac thi nghiem nhu da lam. Con hon hop khi tren ban cho vao dd NaOH,co can thu duoc NaCl khan,dpnc de thu duoc Cl2(O2 it tan trongH2O). |
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jamepotter5
Posts
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Posted - 03/28/2003 : 19:56:03
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Khi de tat ca cac chat nay trong mot hon hop thi Cl se tac dung voi cac kim loai tao thanh cac muoi Cl cua kim loai.
TH1:
Luong Cl vua du hoac du de tac dung het voi cac KL.
Cho hon hop muoi vao H2O,dun de cac khi thoat ra het(neu Cl du).Cho NaOH(du)vao dd,loc ket tua (Fe(OH)3,Mg(OH)2),cho tiep dd Na2CO3(du) vao,loc ket tua(CaCO3,Al2(CO3)3).trong dd con lai NaCL,Na2CO3 ta cho dd HCl,roi dun len de CO2 va HCl(du) thoat ra het.Con lai NaCl khan ,dpnc de thu duoc Cl va Na(Ta khong thu duoc luong Na va Cl nhu ban dau).
TH2:
luong Cl khong du de tac dung,TH nay ta khong xac dinh duoc trong hon hop bao gom nhung chat gi,cung co the tach duoc nhung rat phuc tap. |
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Hihihahihi
9 Posts
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Posted - 04/03/2003 : 17:23:58
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Hi hi! Toi khong ban den cach lam cua cac bac nhung thay de vo li qua! Chang ai lai yeu cau phan biet hay tach chat' khi' voi' chat' ran' ca (ma` trong truong hop nay la` Cl2 va` cac kim loai khac).Dieu` nay` phi thuc te! Do do',cung~ chang can` ban` den' cach' giai lam` gi`!
http://ttvnol.com/forum/f_347 |
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Topic |
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Lam cach nao de phan biet cac kim loai thuong gap