X E M L Ạ I C H Ủ Đ Ề |
bonnie |
trinh bay pp hoa hoc tach rieng tung kim loai ra khoi hon hop:NaCl, CuCl2, FeCl3. yeu cau : khoi luong tung kim loai khong doi
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shang |
dau` tien ta cho Fe vao` hon hop ==> tach duoc FeCl2 ==> Fe
Hon~ hop dung dich con` lai cho OH- vao` ==> CuOH ket tua? xanh ==> Cu
Con` lai trong dung dich la` Na+, Cl-, OH- ta de~ dang` tach duoc Na
THIEU GIA HO NGUYEN TEN HAI
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bonnie |
FeCl2 tan thi lam sao ma tach duoc va khoi luong tung kim loai da thay doi => khong dung voi yeu cau cua de
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shang |
o day la` Fe3+ tac dung voi' Fe ra Fe2+
THIEU GIA HO NGUYEN TEN HAI
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hoang cong tuan |
PTTU~: cho dd Ba(OH)2 vao` tao 2ket tua~
CuCL2+Ba(OH)2--->BaCL2+Cu(OH)2/
2FeCL3+3Ba(OH)2--->3BaCL2+2Fe(OH)3
loc lay' ket' tua~ roi` dem dun no'ng thu duoc Fe2O3&CuO
Cu(OH)2 ---> CuO+H2O
2Fe(OH)3 ---> Fe2O3+3H2O
dd co`n lai la` Ba2+,Na+,Cl-neu cho vua` du~
hoac Ba2+,Na+,Cl-,OH-.
Ta biet BaSO4 ket tua~ BaCl2+H2SO4--->BaSO4 +2HCl
Ba(OH)2+H2SO4--->BaSO4 +2H2O
loc bo~ ket tua~ thu duoc muoi NaCl ban tu la`m nha
luu y' kl ko doi duoc hoa`n tat
acquy_thienthan2002@yahoo.com
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