{"id":1280,"date":"2024-02-23T08:23:32","date_gmt":"2024-02-23T08:23:32","guid":{"rendered":"https:\/\/nbtchemical.com\/?post_type=product&p=1280"},"modified":"2024-02-26T16:20:49","modified_gmt":"2024-02-26T16:20:49","slug":"axit-boric-h3bo3","status":"publish","type":"product","link":"https:\/\/vinachemistry.com\/vi\/product\/axit-boric-h3bo3\/","title":{"rendered":"Axit Boric \u2013 H3BO3"},"content":{"rendered":"

C\u00f4ng th\u1ee9c h\u00f3a h\u1ecdc :\u00a0H3BO3<\/b><\/p>\n

T\u00ean h\u00f3a h\u1ecdc :\u00a0Ax\u00edt Boric, Axit Orthoboric\u00a0<\/strong><\/p>\n

Xu\u1ea5t x\u1ee9:\u00a0NBT Chemical<\/b><\/p>\n

Qui c\u00e1ch :\u00a025 kg\/ bao<\/strong><\/p>\n

T\u00ednh ch\u1ea5t v\u1eadt l\u00fd: <\/strong>d\u1ea1ng b\u1ed9t c\u00f3\u00a0m\u00e0u tr\u1eafng, h\u00f2a\u00a0tan trong n\u01b0\u1edbc d\u1ec5 d\u00e0ng<\/p>\n

T\u00ednh ch\u1ea5t h\u00f3a h\u1ecdc:\u00a0<\/strong><\/p>\n

\u0110i\u1ec1u ch\u1ebf<\/span><\/em><\/p>\n

Acid boric c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ebf khi cho borax (natri tetraborat decahydrat) ph\u1ea3n \u1ee9ng v\u1edbi axit v\u00f4 c\u01a1, nh\u01b0 axit clohidric:<\/p>\n

\n
NA2<\/sub>B4<\/sub>O7<\/sub>\u00b710H2<\/sub>O + 2 HCL \u2192 4 B(OH)3<\/sub>\u00a0[HAY H3<\/sub>BO3<\/sub>] + 2 NACL + 5 H2<\/sub>O<\/dd>\n<\/dl>\n

T\u00ednh ch\u1ea5t<\/span><\/em><\/p>\n

Axit boric c\u00f3 th\u1ec3 tan trong n\u01b0\u1edbc s\u00f4i. Khi nung tr\u00ean 170\u00a0\u00b0C, n\u00f3 t\u00e1ch n\u01b0\u1edbc t\u1ea1o th\u00e0nh\u00a0axit metaboric<\/i>\u00a0(HBO2<\/sub>):<\/p>\n

\n
H3<\/sub>BO3<\/sub>\u00a0\u2192 HBO2<\/sub>\u00a0+ H2<\/sub>O<\/dd>\n<\/dl>\n

Axit metaboric l\u00e0 ch\u1ea5t r\u1eafn k\u1ebft tinh theo h\u1ec7 l\u1eadp ph\u01b0\u01a1ng, c\u00f3 m\u00e0u tr\u1eafng v\u00e0 ch\u1ec9 h\u00f2a tan \u00edt trong n\u01b0\u1edbc. Axit boric n\u00f3ng ch\u1ea3y \u1edf 236\u00a0\u00b0C, v\u00e0 khi nung tr\u00ean 300\u00a0\u00b0C n\u00f3 ti\u1ebfp t\u1ee5c t\u00e1ch n\u01b0\u1edbc t\u1ea1o th\u00e0nh\u00a0axit tetraboric<\/i>\u00a0hay\u00a0axit pyroboric<\/i>\u00a0(H2<\/sub>B4<\/sub>O7<\/sub>):<\/p>\n

\n
4 HBO2<\/sub>\u00a0\u2192 H2<\/sub>B4<\/sub>O7<\/sub>\u00a0+ H2<\/sub>O<\/dd>\n<\/dl>\n

Thu\u1eadt ng\u1eef\u00a0axit boric<\/i>\u00a0\u0111\u00f4i khi c\u0169ng \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 ch\u1ec9 c\u00e1c h\u1ee3p ch\u1ea5t n\u00e0y. N\u1ebfu ti\u1ebfp t\u1ee5c t\u00e1ch n\u01b0\u1edbc, n\u00f3 s\u1ebd t\u1ea1o ra\u00a0boron trioxit<\/span>.<\/p>\n

\n
H2<\/sub>B4<\/sub>O7<\/sub>\u00a0\u2192 2 B2<\/sub>O3<\/sub>\u00a0+ H2<\/sub>O<\/dd>\n<\/dl>\n

Axit boric kh\u00f4ng ph\u00e2n ly trong\u00a0dung m\u00f4i g\u1ed1c n\u01b0\u1edbc<\/span>\u00a0nh\u01b0\u00a0axit Br\u00f8nsted<\/span>, nh\u01b0ng l\u00e0 m\u1ed9t\u00a0axit Lewis<\/span>\u00a0ph\u1ea3n \u1ee9ng v\u1edbi c\u00e1c ph\u00e2n t\u1eed n\u01b0\u1edbc \u0111\u1ec3 t\u1ea1o th\u00e0nh ion\u00a0tetrahydroxyborat<\/span>, v\u00e0 \u0111\u01b0\u1ee3c quan s\u00e1t d\u01b0\u1edbi\u00a0quang ph\u1ed5 Raman<\/span>:<\/p>\n

\n
B(OH)3<\/sub>\u00a0+ H2<\/sub>O\u00a0\"c\u00e2n<\/span>\u00a0B(OH)\u22124 + H+<\/sup>\u00a0(K<\/i>A<\/sub>\u00a0= 5.8\u00d710\u221210<\/sup>\u00a0MOL\/L; PK<\/i>A<\/sub>\u00a0= 9.24)<\/dd>\n<\/dl>\n

C\u00e1c anion polyborat \u0111\u01b0\u1ee3c t\u1ea1o ra t\u1ea1o th\u00e0nh dung d\u1ecbch c\u00f3 pH 7\u201310 n\u1ebfu n\u1ed3ng \u0111\u1ed9 bo l\u1edbn h\u01a1n 0,025\u00a0mol\/L. Ion ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0tetraborat<\/i>\u00a0\u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong borax kho\u00e1ng:<\/p>\n

\n
4 B(OH)\u22124 + 2 H+<\/sup>\u00a0\"c\u00e2n<\/span>\u00a0B4<\/sub>O2\u22127 + 9 H2<\/sub>O<\/dd>\n<\/dl>\n

Axit boric c\u00f3 vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c h\u1ea5p th\u1ee5 c\u00e1c s\u00f3ng \u00e2m t\u1ea7n s\u1ed1 th\u1ea5p trong n\u01b0\u1edbc bi\u1ec3n.<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00f4ng th\u1ee9c h\u00f3a h\u1ecdc :\u00a0H3BO3 T\u00ean h\u00f3a h\u1ecdc :\u00a0Ax\u00edt Boric, Axit Orthoboric\u00a0 Xu\u1ea5t x\u1ee9:\u00a0NBT Chemical Qui c\u00e1ch :\u00a025 kg\/ bao T\u00ednh …<\/p>\n","protected":false},"featured_media":1404,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_cat":[47],"product_tag":[],"class_list":{"0":"post-1280","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-hoa-chat-cho-lam-sach-cong-nghiep","8":"first","9":"instock","10":"shipping-taxable","11":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/vinachemistry.com\/vi\/wp-json\/wp\/v2\/product\/1280","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vinachemistry.com\/vi\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/vinachemistry.com\/vi\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/vinachemistry.com\/vi\/wp-json\/wp\/v2\/comments?post=1280"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vinachemistry.com\/vi\/wp-json\/wp\/v2\/media\/1404"}],"wp:attachment":[{"href":"https:\/\/vinachemistry.com\/vi\/wp-json\/wp\/v2\/media?parent=1280"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/vinachemistry.com\/vi\/wp-json\/wp\/v2\/product_cat?post=1280"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/vinachemistry.com\/vi\/wp-json\/wp\/v2\/product_tag?post=1280"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}