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{"id":24760,"date":"2018-03-30T16:00:09","date_gmt":"2018-03-30T09:00:09","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=24760"},"modified":"2018-03-30T16:00:09","modified_gmt":"2018-03-30T09:00:09","slug":"chuong-7-bai-39-mot-so-hop-chat-cua-crom","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/chuong-7-bai-39-mot-so-hop-chat-cua-crom\/","title":{"rendered":"Ch\u01b0\u01a1ng 7 – B\u00e0i 39: M\u1ed9t s\u1ed1 h\u1ee3p ch\u1ea5t c\u1ee7a crom"},"content":{"rendered":"

B\u00e0i 1 (trang 194 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0C\u00f3 nh\u1eadn x\u00e9t g\u00ec v\u1ec1 t\u00ednh ch\u1ea5t h\u00f3a h\u1ecdc c\u1ee7a c\u00e1c h\u1ee3p ch\u1ea5t Cr(II), Cr(III) v\u00e0 Cr(VI)? d\u1eabn ra nh\u1eefng ph\u1ea3n \u1ee9ng h\u00f3a h\u1ecdc \u0111\u1ec3 ch\u1ee9ng minh.<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Cr(II) c\u00f3 t\u00ednh kh\u1eed m\u1ea1nh:<\/p>\n

2CrCl2<\/sub>+ Cl2<\/sub>\u00a0\u2192 2CrCl3<\/sub><\/p>\n

Cr(III) v\u1eeba c\u00f3 t\u00ednh oxi h\u00f3a v\u1eeba c\u00f3 t\u00ednh kh\u1eed.<\/p>\n

2CrCl3<\/sub>\u00a0+ Zn \u2192 2CrCl2<\/sub>\u00a0+ ZnCl2<\/sub><\/p>\n

2CrCl3<\/sub>\u00a0+ 3Cl2<\/sub>\u00a0+ 16NaOH \u2192 2Na2<\/sub>CrO4<\/sub>\u00a0+ 12NaCl + 8H2<\/sub>\u00a0Cr(VI) c\u00f3 t\u00ednh oxi h\u00f3a m\u1ea1nh.<\/p>\n

2CrO3<\/sub>+ 2NH3<\/sub>\u00a0\u2192 Cr2<\/sub>O3<\/sub>\u00a0+ N2<\/sub>\u00a0+ 3H2<\/sub>O<\/p>\n

B\u00e0i 2 (trang 194 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0C\u00f3 c\u00e1c s\u01a1 \u0111\u1ed3 ph\u1ea3n \u1ee9ng sau:<\/strong><\/p>\n

a. K2<\/sub>Cr2<\/sub>O7<\/sub>\u00a0+ H2<\/sub>S + H2<\/sub>SO4<\/sub>\u00a0\u2192 Cr2<\/sub>(SO4<\/sub>)3<\/sub>\u00a0+ K2<\/sub>SO4<\/sub>\u00a0+ H2<\/sub>O +<\/p>\n

b. K2<\/sub>Cr2<\/sub>O7<\/sub>\u00a0+ HCl \u2192 CrCl3<\/sub>\u00a0+ Cl2<\/sub>\u00a0+ KCl + H2<\/sub>O<\/p>\n

c. K2<\/sub>Cr2<\/sub>O7<\/sub>\u00a0+ FeSO4<\/sub>\u00a0\u2192 Cr2<\/sub>(SO4<\/sub>)3<\/sub>\u00a0+ K2<\/sub>SO4<\/sub>\u00a0+ H2<\/sub>O+ Fe2<\/sub>(SO4<\/sub>)3<\/sub><\/p>\n

1) L\u1eadp c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh ph\u1ea3n \u1ee9ng h\u00f3a h\u1ecdc cho nh\u1eefng ph\u1ea3n \u1ee9ng tr\u00ean.<\/p>\n

2) Cho bi\u1ebft vai tr\u00f2 c\u00e1c ch\u1ea5t tham gia ph\u1ea3n \u1ee9ng.<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/p>\n

B\u00e0i 3 (trang 194 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0Ng\u01b0\u1eddi ta c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ebf Cr(III) oxit b\u1eb1ng c\u00e1ch ph\u00e2n h\u1ee7y mu\u1ed1i amoni \u0111icromat \u1edf nhi\u1ec7t \u0111\u1ed9 cao: (NH4<\/sub>)2<\/sub>Cr2<\/sub>O7<\/sub>\u00a0\u2192N2<\/sub>\u00a0+ Cr2<\/sub>O3<\/sub>\u00a0+ 4H2<\/sub>O H\u00e3y cho bi\u1ebft ph\u1ea3n \u1ee9ng tr\u00ean thu\u1ed9c lo\u1ea1i ph\u1ea3n \u1ee9ng n\u00e0o v\u00e0 l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh h\u00f3a h\u1ecdc<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

(NH4<\/sub>)2<\/sub>Cr2<\/sub>O7<\/sub>\u00a0\u2192 N2<\/sub>\u00a0+ Cr2<\/sub>O3<\/sub>\u00a0+ 4H2<\/sub>O<\/p>\n

2N-3<\/sup>\u00a0\u2013 3e \u2192 2No<\/sup>\u00a0+ 3e.2<\/p>\n

N-3<\/sup>\u00a0l\u00e0 ch\u1ea5t kh\u1eed<\/p>\n

2Cr+6<\/sup>\u00a0+ 3e.2 \u2192 2Cr+3<\/sup><\/p>\n

Cr-6 l\u00e0 ch\u1ea5t oxi h\u00f3a<\/p>\n

\n
\n

B\u00e0i 4 (trang 194 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0Vi\u1ebft ph\u01b0\u01a1ng tr\u00ecnh oxi h\u00f3a – kh\u1eed (d\u1ea1ng ph\u00e2n t\u1eed v\u00e0 ion r\u00fat g\u1ecdn) gi\u1eefa kali \u0111icr\u00f2mat v\u00e0 natri sunfua khi c\u00f3 m\u1eb7t axit sunfuric. Bi\u1ebft r\u1eb1ng trong ph\u1ea3n \u1ee9ng n\u00e0y c\u00f3 s\u1ef1 bi\u1ebfn \u0111\u1ed5i s\u1ed1 oxi h\u00f3a nh\u01b0 sau:<\/strong><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

K2<\/sub>Cr2<\/sub>O7<\/sub>\u00a0+ 3Na2<\/sub>S + 7H2<\/sub>SO4<\/sub>\u00a0\u2192 K2<\/sub>SO4<\/sub>\u00a0+ Cr2<\/sub>(SO4<\/sub>)3<\/sub>\u00a0+ 3Na2<\/sub>SO4<\/sub>\u00a0+ 3S + 7H2<\/sub>O<\/p>\n

Ph\u01b0\u01a1ng tr\u00ecnh ion :<\/p>\n

Cr2<\/sub>O2-<\/sup>7 + 3S2-<\/sup>\u00a0+ 14H+<\/sup>\u00a0\u2192 2Cr3+<\/sup>\u00a0+ 3S + 7H2<\/sub>O<\/p>\n

B\u00e0i 5 (trang 194 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0Mu\u1ed1i Cr(III) t\u00e1c d\u1ee5ng v\u1edbi ch\u1ea5t oxi h\u00f3a m\u1ea1nh trong m\u00f4i tr\u01b0\u1eddng ki\u1ec1m t\u1ea1o th\u00e0nh mu\u1ed1i Cr(VI)<\/strong><\/p>\n

a. H\u00e3y l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh h\u00f3a h\u1ecdc c\u1ee7a ph\u1ea3n \u1ee9ng sau:<\/p>\n

CrCl3<\/sub>\u00a0+ Cl2<\/sub>\u00a0+ NaOH \u2192 Na2<\/sub>CrO4<\/sub>\u00a0+ NaCl + H2<\/sub>O<\/p>\n

V\u00e0 cho bi\u1ebft vai tr\u00f2 c\u00e1c ch\u1eaft CrCl3<\/sub>\u00a0v\u00e0 Cl2<\/sub>\u00a0trong ph\u1ea3n \u1ee9ng. Gi\u1ea3i th\u00edch?<\/p>\n

b. Mu\u1ed1i Cr(III) t\u00e1c d\u1ee5ng v\u1edbi ch\u1ea5t kh\u1eed t\u1ea1o th\u00e0nh mu\u1ed1i Cr(II). H\u00e3y l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh c\u1ee7a ph\u1ea3n \u1ee9ng sau:<\/p>\n

CrCl3<\/sub>\u00a0+ Zn \u2192 CrCl2<\/sub>\u00a0+ ZnCl2<\/sub><\/p>\n

v\u00e0 cho bi\u1ebft vai tr\u00f2 c\u00e1c ch\u1ea5t CrCl3<\/sub>\u00a0v\u00e0 Zn.<\/p>\n

c. H\u00e3y cho k\u1ebft lu\u1eadn v\u1ec1 t\u00ednh ch\u1ea5t h\u00f3a h\u1ecdc c\u1ee7a mu\u1ed1i Cr(III).<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/p>\n

Mu\u1ed1i Cr(III) v\u1eeba c\u00f3 t\u00ednh oxi h\u00f3a v\u1eeba c\u00f3 t\u00ednh kh\u1eed<\/p>\n

S\u1ea3n ph\u1ea9m oxi h\u00f3a Cr(III) l\u00e0 Cr(VI)<\/p>\n

S\u1ea3n ph\u1ea9m kh\u1eed Cr(III) l\u00e0 Cr(II)<\/p>\n<\/div>\n<\/div>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

B\u00e0i 1 (trang 194 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0C\u00f3 nh\u1eadn x\u00e9t g\u00ec v\u1ec1 t\u00ednh ch\u1ea5t h\u00f3a h\u1ecdc c\u1ee7a c\u00e1c h\u1ee3p ch\u1ea5t Cr(II), Cr(III) v\u00e0 Cr(VI)? d\u1eabn ra nh\u1eefng ph\u1ea3n \u1ee9ng h\u00f3a h\u1ecdc \u0111\u1ec3 ch\u1ee9ng minh. L\u1eddi gi\u1ea3i: Cr(II) c\u00f3 t\u00ednh kh\u1eed m\u1ea1nh: 2CrCl2+ Cl2\u00a0\u2192 2CrCl3 Cr(III) v\u1eeba c\u00f3 t\u00ednh oxi h\u00f3a v\u1eeba c\u00f3 t\u00ednh kh\u1eed. […]<\/p>\n","protected":false},"author":3,"featured_media":24764,"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":"\nCh\u01b0\u01a1ng 7 - B\u00e0i 39: M\u1ed9t s\u1ed1 h\u1ee3p ch\u1ea5t c\u1ee7a crom<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/chuong-7-bai-39-mot-so-hop-chat-cua-crom\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ch\u01b0\u01a1ng 7 - B\u00e0i 39: M\u1ed9t s\u1ed1 h\u1ee3p ch\u1ea5t c\u1ee7a crom\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 194 sgk H\u00f3a 12 n\u00e2ng cao):\u00a0C\u00f3 nh\u1eadn x\u00e9t g\u00ec v\u1ec1 t\u00ednh ch\u1ea5t h\u00f3a h\u1ecdc c\u1ee7a c\u00e1c h\u1ee3p ch\u1ea5t Cr(II), Cr(III) v\u00e0 Cr(VI)? d\u1eabn ra nh\u1eefng ph\u1ea3n \u1ee9ng h\u00f3a h\u1ecdc \u0111\u1ec3 ch\u1ee9ng minh. L\u1eddi gi\u1ea3i: Cr(II) c\u00f3 t\u00ednh kh\u1eed m\u1ea1nh: 2CrCl2+ Cl2\u00a0\u2192 2CrCl3 Cr(III) v\u1eeba c\u00f3 t\u00ednh oxi h\u00f3a v\u1eeba c\u00f3 t\u00ednh kh\u1eed. 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