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{"id":734,"date":"2016-09-24T07:22:19","date_gmt":"2016-09-24T07:22:19","guid":{"rendered":"http:\/\/vuhoangco.com.vn\/en\/?post_type=product&p=734"},"modified":"2016-09-24T07:42:15","modified_gmt":"2016-09-24T07:42:15","slug":"734","status":"publish","type":"product","link":"http:\/\/vuhoangco.com.vn\/en\/product\/734\/","title":{"rendered":"Sodium Hydrosulfite – Na2S2O4"},"content":{"rendered":"

T\u00ednh ch\u1ea5t v\u1eadt l\u00fd:\u00a0<\/strong><\/em>D\u1ea1ng b\u1ed9t tinh th\u1ec3 tr\u1eafng; kh\u00f4ng m\u00f9i ho\u1eb7c c\u00f3 m\u00f9i kh\u00ed SO2 nh\u1eb9
\n<\/strong><\/em><\/p>\n

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

Na2S2O4\u00a0\u00a0b\u1ec1n khi \u0111un n\u00f3ng, nh\u01b0ng b\u1ecb oxi h\u00f3a ch\u1eadm b\u1edfi kh\u00f4ng kh\u00ed khi \u1edf trong dung d\u1ecbch. Th\u1eadm ch\u00ed khi kh\u00f4ng c\u00f3 kh\u00f4ng kh\u00ed, dung d\u1ecbch natri \u0111ithionit c\u0169ng b\u1ecb h\u1ecfng v\u00ec x\u1ea3y ra ph\u1ea3n \u1ee9ng:<\/p>\n

\n
2 S2<\/sub>O4<\/sub>2-<\/sup>\u00a0+ H2<\/sub>O \u2192 S2<\/sub>O3<\/sub>2-<\/sup>\u00a0+ 2 HSO3<\/sub>–<\/sup><\/dd>\n<\/dl>\n

Do \u0111\u00f3 dung d\u1ecbch natri \u0111ithionit kh\u00f4ng th\u1ec3 b\u1ea3o qu\u1ea3n trong th\u1eddi gian d\u00e0i.
\n<\/a><\/sup><\/p>\n

\u1ede tr\u1ea1ng th\u00e1i khan l\u00e0 tinh th\u1ec3 \u0111\u01a1n t\u00e0 c\u00f3 m\u00f9i l\u01b0u hu\u1ef3nh nh\u1eb9. N\u00f3 tan trong n\u01b0\u1edbc v\u00e0 r\u1ea5t \u00edt trong etanol. \u1ede tr\u1ea1ng th\u00e1i ng\u1eadm n\u01b0\u1edbc \u0111ihi\u0111rat l\u00e0 tinh th\u1ec3 h\u00ecnh tr\u1ee5, v\u00e0 n\u00f3 kh\u00f4ng b\u1ec1n khi d\u1ec5 d\u00e0ng t\u00e1ch n\u01b0\u1edbc t\u1ea1o th\u00e0nh d\u1ea1ng khan v\u00e0 d\u1ec5 d\u00e0ng b\u1ecb oxi h\u00f3a b\u1edfi kh\u00f4ng kh\u00ed.<\/p>\n

D\u1ea1ng khan ph\u00e2n h\u1ee7y d\u1ea7n d\u1ea7n t\u1ea1o\u00a0natri sunfat\u00a0v\u00e0\u00a0l\u01b0u hu\u1ef3nh \u0111i\u00f4xit\u00a0\u1edf nhi\u1ec7t \u0111\u1ed9 tr\u00ean 90 \u00b0C trong kh\u00f4ng kh\u00ed. Khi v\u1eafng m\u1eb7t kh\u00f4ng kh\u00ed, n\u00f3 s\u1ebd ph\u00e2n h\u1ee7y \u1edf nhi\u1ec7t \u0111\u1ed9 tr\u00ean 150 \u00b0C t\u1ea1o th\u00e0nh\u00a0natri sulfit,\u00a0natri thiosulfat, l\u01b0u hu\u1ef3nh \u0111ioxit v\u00e0 m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf d\u1ea1ng d\u1ea5u v\u1ebft c\u1ee7a l\u01b0u hu\u1ef3nh.<\/p>\n

Natri \u0111ithionit khan d\u1ea1ng b\u1ed9t v\u1edbi m\u1ed9t \u00edt n\u01b0\u1edbc c\u00f3 th\u1ec3 b\u1eaft l\u1eeda trong kh\u00f4ng kh\u00ed \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00e2n h\u1ee7y. Khi thi\u1ebfu kh\u00f4ng kh\u00ed (oxi), n\u00f3 ch\u1ec9 ph\u00e2n h\u1ee7y ch\u1eadm.<\/p>\n

Dung d\u1ecbch natri \u0111ithionit c\u00f3 t\u00ednh axit v\u00e0 ph\u00e2n h\u1ee7y t\u1ea1o th\u00e0nh natri thiosulfat v\u00e0 natri bisulfit. T\u1ed1c \u0111\u1ed9 ph\u1ea3n \u1ee9ng t\u0103ng khi t\u0103ng nhi\u1ec7t \u0111\u1ed9. Ngo\u00e0i ra, t\u1ed1c \u0111\u1ed9 c\u0169ng t\u0103ng khi x\u1ea3y ra trong m\u00f4i tr\u01b0\u1eddng axit m\u1ea1nh.<\/p>\n

\n
2 Na2<\/sub>S2<\/sub>O4<\/sub>\u00a0+ H2<\/sub>O \u2192 Na2<\/sub>S2<\/sub>O3<\/sub>\u00a0+ 2 NaHSO3<\/sub><\/dd>\n<\/dl>\n

Khi c\u00f3 m\u1eb7t oxi, n\u00f3 ph\u00e2n h\u1ee7y th\u00e0nh\u00a0natri bisulfat\u00a0v\u00e0\u00a0natri bisulfit.<\/p>\n

\n
Na2<\/sub>S2<\/sub>O4<\/sub>\u00a0+ O2<\/sub>\u00a0+ H2<\/sub>O \u2192 NaHSO4<\/sub>\u00a0+ NaHSO3<\/sub><\/dd>\n<\/dl>\n

Natri bisulfat v\u00e0 natri bisulfit l\u00e0m gi\u1ea3m pH v\u00e0 v\u00ec th\u1ebf l\u00e0m t\u0103ng t\u1ed1c \u0111\u1ed9 ph\u1ea3n \u1ee9ng. L\u01b0u hu\u1ef3nh \u0111ioxit \u0111\u01b0\u1ee3c t\u1ea1o ra d\u01b0\u1edbi \u0111i\u1ec1u ki\u1ec7n axit m\u1ea1nh.<\/p>\n

\n
2 H2<\/sub>S2<\/sub>O4<\/sub>\u00a0\u2192 3 SO2<\/sub>\u00a0+ S + 2 H2<\/sub>O<\/dd>\n
3 H2<\/sub>S2<\/sub>O4<\/sub>\u00a0\u2192 5 SO2<\/sub>\u00a0+ H2<\/sub>S + 2 H2<\/sub>O<\/dd>\n<\/dl>\n

Tr\u00e1i l\u1ea1i, trong dung d\u1ecbch ki\u1ec1m (pH 9-11) natri \u0111ithionit b\u1ec1n v\u00e0 ch\u1ec9 b\u1ecb ph\u00e2n h\u1ee7y kho\u1ea3ng 1% trong 1 gi\u1edd. N\u00f3 c\u00f3 t\u00ednh kh\u1eed m\u1ea1nh v\u00e0 ph\u00e2n h\u1ee7y th\u00e0nh mu\u1ed1i\u00a0sunfit\u00a0v\u00e0\u00a0sunfua.<\/p>\n

\n
3 Na2<\/sub>S2<\/sub>O4<\/sub>\u00a0+ 6 NaOH \u2192 5 Na2<\/sub>SO3<\/sub>\u00a0+ Na2<\/sub>S + 3 H2<\/sub>O<\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"

C\u00f4ng th\u1ee9c h\u00f3a h\u1ecdc : Na2S2O4<\/b><\/p>\n

T\u00ean h\u00f3a h\u1ecdc : Sodium Hydrosulfite – Natri Dithionite –\u00a0Sodium dithionite\u00a0<\/strong><\/p>\n

T\u00ean g\u1ecdi kh\u00e1c: T\u1ea9y \u0111\u01b0\u1eddng<\/strong><\/p>\n

Xu\u1ea5t x\u1ee9:\u00a0Trung Qu\u1ed1c<\/strong><\/p>\n

Qui c\u00e1ch :\u00a050 kg\/ can<\/strong><\/p>\n","protected":false},"featured_media":736,"comment_status":"open","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"http:\/\/vuhoangco.com.vn\/en\/wp-json\/wp\/v2\/product\/734"}],"collection":[{"href":"http:\/\/vuhoangco.com.vn\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"http:\/\/vuhoangco.com.vn\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"http:\/\/vuhoangco.com.vn\/en\/wp-json\/wp\/v2\/comments?post=734"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/vuhoangco.com.vn\/en\/wp-json\/wp\/v2\/media\/736"}],"wp:attachment":[{"href":"http:\/\/vuhoangco.com.vn\/en\/wp-json\/wp\/v2\/media?parent=734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}