ʻO Sodium Cyanide: Nā Pono Kemika a me nā Mechanism Reaction

Introduction

Sodium cyanide (NaCN) he hui kemika i loaʻa nā noi ʻoihana ʻelua a me nā hopena palekana koʻikoʻi ma muli o kona ʻano ʻona. Ka hoomaopopo ana i kona Nā meaʻokoʻa a he mea koʻikoʻi nā ʻano ʻano hana no ka mālama pono ʻana, ka hoʻohana ʻana i ka ʻoihana, a me ka pale ʻana i ke kaiapuni. Ke manaʻo nei kēia ʻatikala e hāʻawi i kahi hiʻohiʻona piha o nā ʻano kemika a me nā ala pane o ʻO Sodium cyanide.

ʻO nā waiwai kemika o ka Sodium Cyanide

Keʻano kino

ʻO ka sodium cyanide kahi paʻa keʻokeʻo keʻokeʻo ma ka lumi wela. Loaʻa iā ia kahi ʻano aniani cubic a ʻike pinepine ʻia e like me nā granule liʻiliʻi, ʻaʻole ʻala (ke maloʻo) a i ʻole ka pauka. Eia nō naʻe, ke hoʻopili ʻia me ka makū a i ʻole nā ​​​​ʻakika, hiki iā ia ke hoʻokuʻu i ke kinoea hydrogen cyanide, nona kahi ʻala ʻawaʻawa ʻawaʻawa. He mea nui e hoʻomaopopo ʻaʻole hiki i nā kānaka a pau ke ʻike i kēia ʻala, no ka mea, ua hoʻoholo ʻia ka hiki ke honi ia mea.

Palekana

Hiki ke hoʻoheheʻe ʻia ka NaCN i ka wai. Ke hoʻoheheʻe ʻia i loko o ka wai, ua hoʻokaʻawale ʻia i loko o nā ion sodium (Na⁺) a me nā ion cyanide (CN⁻) e like me ka hoohalike penei:

NaCN(s) H2O, Na+(aq) Na+ (aq) + CN-(aq)

ʻO kēia hoʻoheheʻe kiʻekiʻe i ka wai e lilo ia i mea pōʻino kaiapuni no ka mea hiki ke hoʻohaumia i nā kumu wai. Hiki ke hoʻoheheʻe ʻia i loko o kekahi polar organic solvents e like me ka methanol a me ka ethanol.

ʻO ke kūlana

Paʻa ka sodium cyanide ma lalo o nā kūlana maʻamau. Eia nō naʻe, paʻakikī ia i ka wela, ka wai, a me nā waikawa. Ke hoʻomehana ʻia, hiki ke decompose, hoʻokuʻu i ke kinoea hydrogen cyanide kino loa. Ma ke alo o nā ʻakika, a me nā ʻakika nāwaliwali e like me ka waikawa kalapona (i hana ʻia i ka wā e hoʻoheheʻe ʻia ai ka carbon dioxide i loko o ka wai), hiki mai kēia pane: -NaCN + H2O + CO2 → NaHCO3 + HCN↑

Hōʻike kēia pane i ke koʻikoʻi o ka mālama ʻana ʻO ka sodium Cyanide ma kahi maloʻo a maʻalili i kaʻawale mai nā mea ʻawaʻawa.

Nā Hana Hana o ka Sodium Cyanide

Pane me Metala

Ua kaulana ʻo Sodium cyanide - no kona hiki ke hana i nā paʻakikī me nā metala. ʻO kekahi o nā noi maʻamau i ka ʻohi ʻana i ke gula a me ke kālā mai kā lākou ores i ka ʻoihana mining. Ma ke alo o ka oxygen a me ka wai, ka sodium cyanide hoʻopili me ke gula (Au) i loko o ka ʻeleʻele e hana i ke gula hoʻoheheʻe - cyanide complex. Hiki ke hōʻike ʻia ka hopena holoʻokoʻa e like me:

4Au+8NaCN+O2+2H2O→4Na[Au(CN)2]+ 4NaOH

Ma kēia pane ʻana, hui pū nā iona cyanide me nā ʻātoma gula, e hoʻohuli ana i ke gula hiki ʻole ke hoʻoheheʻe ʻia i loko o ka ʻeleʻele i loko o kahi paʻakikī hiki ke hoʻokaʻawale ʻia mai ka pōhaku i koe a me nā mea haumia ʻē aʻe. ʻO ke ʻano o ka hopena e pili ana i ka oxidation o ke gula e ka oxygen, a ukali ʻia e ka paʻakikī o ke gula oxidized me nā ion cyanide.

Nucleophilic Substitution Reactions

He mau nucleophiles ikaika nā iona cyanide (CN⁻). I loko o ke kemika organik, hiki iā lākou ke komo i nā hopena hoʻololi nucleophilic. No ka la'ana, ke ho'ohenehene ka alkyl halide (R - X, kahi R he hui alkyl a me X he halogen) me ka sodium cyanide i loko o ka solvent aprotic e like me dimethyl sulfoxide (DMSO), e like me keia:RX + NaCNR-CN + NaX

Hoʻouka ka cyanide ion i ka ʻātoma kalapona i hoʻopaʻa ʻia i ka halogen, e hoʻoneʻe ana i ka atom halogen i kahi pane hoʻololi. Hoʻohana nui ʻia kēia hopena i ka synthesis o nā nitriles, he mau mea koʻikoʻi i ka hana ʻana i nā pūhui organik like ʻole e like me nā waikawa carboxylic, amines, a me nā pūhui heterocyclic.

Pane me ka wai (Hydrolysis)

E like me ka mea i ʻōlelo ʻia ma mua, hiki i ka sodium cyanide ke hana me ka wai i kahi hopena hydrolysis. I mua o ka wai, hiki i ka cyanide ion ke ʻae i kahi proton mai ka wai e hana i ka hydrogen cyanide a me nā ion hydroxide:CN-(aq) + H2O(l) HCN (aq) + OH-(aq)

Hiki ke hoʻohuli ʻia kēia hopena hydrolysis, a ʻo ke kūlana o ka equilibrium e pili ana i nā mea e like me ka pH a me ka mahana. I loko o nā hāʻina ʻakika, hoʻololi ka equilibrium i ka hoʻokumu ʻana i ke kinoea hydrogen cyanide, ʻoiai ma nā haʻina kumu, noho nui ka cyanide ion i kona ʻano anionic.