4<\/sub>Cl. Ch\u1ec9 d\u00f9ng c\u00e1c \u1ed1ng nghi\u1ec7m v\u00e0 dung d\u1ecbch NaOH l\u1ea7n l\u01b0\u1ee3t th\u00eam v\u00e0o t\u1eebng dung d\u1ecbch c\u00f3 th\u1ec3 nh\u1eadn bi\u1ebft t\u1ed1i \u0111a \u0111\u01b0\u1ee3c m\u1ea5y dung d\u1ecbch trong c\u00e1c dung d\u1ecbch k\u1ec3 tr\u00ean?<\/strong><\/p>\nA. 2 dung d\u1ecbch<\/p>\n
B. 3 dung d\u1ecbch<\/p>\n
C. 4 dung d\u1ecbch<\/p>\n
D. 5 dung d\u1ecbch<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
\u0110\u00e1p \u00e1n D<\/p>\n
Cho NaOH l\u1ea7n l\u01b0\u1ee3t v\u00e0o c\u00e1c m\u1eabu th\u1eed.<\/p>\n
– M\u1eabu th\u1eed n\u00e0o c\u00f3 k\u1ebft t\u1ee7a tr\u1eafng xanh sau \u0111\u00f3 h\u00f3a n\u00e2u \u0111\u1ecf ngo\u00e0i kh\u00f4ng kh\u00ed l\u00e0 FeCl2<\/sub>\u00a0:<\/p>\nFeCl2<\/sub>+ 2NaOH \u2192 Fe(OH)2<\/sub>\u00a0\u2193 +2NaCl<\/p>\n4Fe(OH)2<\/sub>\u00a0+ O2<\/sub>\u00a0+ 2H2<\/sub>O \u2192 4Fe(OH)3<\/sub>\u00a0\u2193<\/p>\n– M\u1eabu th\u1eed n\u00e0o t\u1ea1o k\u1ebft t\u1ee7a n\u00e2u \u0111\u1ecf l\u00e0 FeCl3<\/sub><\/p>\nFeCl3<\/sub>+ 3NaOH \u2192 Fe(OH)3<\/sub>\u00a0\u2193 +3NaCl<\/p>\n– M\u1eabu th\u1eed n\u00e0o t\u1ea1o k\u1ebft t\u1ee7a m\u00e0u xanh l\u00e0 CuCl2<\/sub><\/p>\nCuCl2<\/sub>\u00a0+ 2NaOH \u2192 Cu(OH)2<\/sub>\u00a0\u2193 +2NaCl<\/p>\n– M\u1eabu th\u1eed n\u00e0o ban \u0111\u1ea7u xu\u1ea5t hi\u1ec7n k\u1ebft t\u1ee7a tr\u1eafng sau \u0111\u00f3 k\u1ebft t\u1ee7a tan ra l\u00e0 AlCl3<\/sub><\/p>\nAlCl3<\/sub>\u00a0+ 3NaOH \u2192 Al(OH)3<\/sub>\u00a0+ 3NaCl<\/p>\nAl(OH)3<\/sub>\u00a0+ NaOH \u2192 Na[Al(OH)4<\/sub>]<\/p>\n– M\u1eabu th\u1eed n\u00e0o xu\u1ea5t hi\u1ec7n kh\u00ed m\u00f9i khai tho\u00e1t l\u00ean, l\u00e0m xanh gi\u1ea5y qu\u1ef3 t\u00edm l\u00e0 NH4<\/sub>Cl<\/p>\nNH4<\/sub>Cl+ NaOH \u2192 NaCl + NH3<\/sub>\u00a0\u2191 +H2<\/sub>O<\/p>\nB\u00e0i 2 (trang 250 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0Cho dung d\u1ecbch A ch\u1ee9a c\u00e1c cation Ba2+<\/sup>, Fe3+<\/sup>\u00a0, Cu2+<\/sup>. Tr\u00ecnh b\u00e0y c\u00e1ch nh\u1eadn bi\u1ebft s\u1ef1 c\u00f3 m\u1eb7t c\u1ee7a c\u00e1c cation \u0111\u00f3 trong A.<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
L\u1ea5y m\u1ed9t \u00edt dung d\u1ecbch, nh\u1ecf t\u1eeb t\u1eeb NaOH v\u00e0o, l\u1ecdc l\u1ea5y k\u1ebft t\u1ee7a \u0111em h\u00f2a tan b\u1eb1ng dung d\u1ecbch NH3<\/sub>\u00a0th\u1ea5y k\u1ebft t\u1ee7a tan m\u1ed9t ph\u1ea7n t\u1ea1o th\u00e0nh dung d\u1ecbch c\u00f3 m\u00e0u xanh th\u1eabm => c\u00f3 Cu2+<\/sup><\/p>\nCu2+<\/sup>\u00a0+ 2OH–<\/sup>\u00a0\u2192 Cu (OH)2<\/sub><\/p>\nCu(OH)2<\/sub>\u00a0+ 4NH3<\/sub>\u00a0\u2192 [Cu(NH3<\/sub>)4<\/sub>]2+<\/sup>\u00a0+ 2OH–<\/sup><\/p>\nPh\u1ea7n k\u1ebft t\u1ee7a kh\u00f4ng tan trong NH3<\/sub>\u00a0c\u00f3 m\u00e0u n\u00e2u \u0111\u1ecf l\u00e0 Fe(OH)3<\/sub>\u00a0=> c\u00f3 Fe3+<\/sup><\/p>\nFe3+<\/sup>\u00a0+3OH–<\/sup>\u00a0\u2192 Fe(OH)3<\/sub>\u00a0m\u00e0u n\u00e2u \u0111\u1ecf.<\/p>\nL\u1ea5y m\u1ed9t \u00edt dung d\u1ecbch, nh\u00f2 t\u1eeb t\u1eeb Na2<\/sub>SO4<\/sub>\u00a0v\u00e0 m\u1ed9t \u00edt dung d\u1ecbch H2<\/sub>SO4<\/sub>\u00a0lo\u00e3ng v\u00e0o, th\u1ea5y xu\u1ea5t hi\u1ec7n k\u1ebft t\u1ee7a tr\u1eafng kh\u00f4ng tan trong axit H2<\/sub>SO4<\/sub>. \u0110\u00f3 l\u00e0 BaSO4<\/sub>\u00a0trong dung d\u1ecbch c\u00f3 ch\u1ee9a ion Ba2+<\/sup><\/p>\nBa2+<\/sup>\u00a0+ SO2<\/sub>–<\/sup>\u00a0\u2192 BaSO4<\/sub>\u00a0\u2193<\/p>\nB\u00e0i 3 (trang 250 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0Cho c\u00e1c dung d\u1ecbch ch\u1ee9a c\u00e1c caton ri\u00eang bi\u1ec7t Mg2+<\/sup>, \u1ea0l3+<\/sup>, Ni2+<\/sup>,Cl-, SO4<\/sub>2-<\/sup>. Tr\u00ecnh b\u00e0y c\u00e1ch nh\u1eadn bi\u1ebft s\u1ef1 c\u00f3 m\u1eb7t c\u1ee7a c\u00e1c ion trong dung d\u1ecbch \u0111\u00f3.<\/strong><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Nh\u1eadn bi\u1ebft c\u00e1c ion ri\u00eang bi\u1ec7t: Mg2+<\/sup>, Al3+<\/sup>, Ni2+<\/sup>, Cr, SO4<\/sub>2-<\/sup><\/p>\n– Nh\u1ecf v\u00e0o c\u00e1c m\u1eabu dung d\u1ecbch thu\u1ed1c th\u1eed l\u00e0 NaOH:<\/p>\n
Nh\u1eadn ra ion Mg2+<\/sup>\u00a0v\u00ec c\u00f3 k\u1ebft t\u1ee7a tr\u1eafng: Mg2+<\/sup>\u00a0+ 2OH–<\/sup>\u00a0\u2192 Mg(OH)2<\/sub>\u00a0\u2193<\/p>\nNh\u1eadn ra ion Al3+<\/sup>\u00a0v\u00ec c\u00f3 k\u1ebft t\u1ee7a tr\u1eafng sau \u0111\u00f3 tan ra khi th\u00eam OH–<\/sup><\/p>\nAl3+<\/sup>\u00a0+ 3OH–<\/sup>\u00a0\u2192 Al(OH)3<\/sub>\u00a0\u2193<\/p>\nAl(OH)3<\/sub>\u00a0\u2193 + OH–<\/sup>\u00a0\u2192 [Al(OH)4<\/sub>]- tan<\/p>\nNh\u1eadn ra ion Ni2+<\/sup>\u00a0v\u00ec c\u00f3 k\u1ebft t\u00f9a m\u00e0u xanh l\u1ee5c Ni2+<\/sup>\u00a0+ 2OH–<\/sup>\u00a0\u2192 Ni(OH)2<\/sub>\u00a0\u2193<\/p>\n– Nh\u1ecf v\u00e0o hai m\u1eabu thu\u1ed1c th\u1eed ch\u1ee9a hai anion dung d\u1ecbch ch\u1ee9a Ba2+<\/sup>. Nh\u1eadn ra ion SO4<\/sub>2-<\/sup>v\u00ec t\u1ea1o ch\u1ea5t k\u1ebft t\u1ee7a m\u00e0u tr\u1eafng kh\u00f4ng tan trong axit<\/p>\nBa2+<\/sup>\u00a0+ SO2-<\/sup>\u00a0\u2192 BaSO4<\/sub>\u00a0\u2193<\/p>\nM\u1eabu ch\u1ee9a ion Cr l\u00e0 m\u1eabu c\u00f2n l\u1ea1i.<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
B\u00e0i 1 (trang 250 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0C\u00f3 c\u00e1c l\u1ecd h\u00f3a ch\u1ea5t m\u1ea5t nh\u00e3n, trong m\u1ed7i l\u1ecd \u0111\u1ef1ng m\u1ed9t trong c\u00e1c dung d\u1ecbch sau: FeCl2, FeCl3\u00a0, CuCl2, AlCl3\u00a0, NH4Cl. Ch\u1ec9 d\u00f9ng c\u00e1c \u1ed1ng nghi\u1ec7m v\u00e0 dung d\u1ecbch NaOH l\u1ea7n l\u01b0\u1ee3t th\u00eam v\u00e0o t\u1eebng dung d\u1ecbch c\u00f3 th\u1ec3 nh\u1eadn bi\u1ebft t\u1ed1i \u0111a \u0111\u01b0\u1ee3c m\u1ea5y dung […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1306],"tags":[1429,1430],"yoast_head":"\n
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