Sodium Cyanide: Nhanganyaya kune Yayo Chemical Properties uye Reaction Mechanisms

Sodium cyanide (NaCN) chinhu chakanyanya kukosha inorganic kompleti ine huwandu hwakasiyana hwekushandisa mumaindasitiri akasiyana siyana, asi zvakare inozivikanwa nekunyanyisa kwayo muchetura. Kunzwisisa kwayo Makemikari zvinhu uye maitiro ekuita akakosha pakubata kwakachengeteka, kushandiswa kunoshanda, uye Kuchengetedzwa kwemagariro. Iyi blog post ine chinangwa chekupa tarisiro yakazara yezvinhu izvi.

Chemical Properties yeSodium Cyanide

Sodium cyanide ichena, crystalline yakasimba inonyungudika zvakanyanya mumvura, ichigadzira alkaline solution yakasimba. Kunyungudika kwayo mumvura kunokonzerwa neiyo ionic yekomboni. Mumamiriro akasimba, NaCN ine sodium cations (Na⁺) uye cyanide anions (CN⁻) yakabatwa pamwe chete nema ionic bond. Kana yanyungudutswa mumvura, maion aya anopatsanuka, achibvumira musanganiswa kuti unyungudika nyore. Maitiro ekumisa anogona kumiririrwa neiyo equation: NaCN(s) → Na⁺(aq) + CN⁻(aq).

Solubility iyi inopa Sodium cyanide kufamba kwakakwirira munzvimbo dzine mvura, iyo ine zvose zvinoshanda zvekushandisa uye zvakatipoteredza. Semuenzaniso, mumigodhi yegoridhe, iyo inonyungudika yeNaCN inoita kuti igadzire macomplexes ane maion egoridhe, kufambisa kutorwa kwegoridhe kubva musimbi. Nekudaro, zvinoreva zvakare kuti kana ikasabatwa nemazvo, Sodium Cyanide inogona kusvibisa matsime emvura zviri nyore.

Panyaya yezvimiro zvemuviri, sodium cyanide ine nzvimbo yakanyanyisa kunyungudika inosvika 563.7 °C uye nzvimbo yekuvira ye1496 °C. Aya mapoinzi akanyanya kunyungudika uye ari kufashaira hunhu hwemaionic makomisheni, ayo anoda huwandu hwakakura hwesimba kutyora mabhondi eionic akasimba akabata maion pamwechete.

Imwe yakakosha kemikari pfuma ye sodium cyanide ndeye reactivity yayo nemaasidhi. Kana sodium cyanide ikasangana nemaasidhi, inokurumidza kuita chimwe chinhu kuumba hydrogen cyanide (HCN), gasi rine muchetura uye rinoputika. Zvinoitwa neasidhi yakasimba, yakadai sehydrochloric acid (HCl), inogona kunyorwa se: NaCN + HCl → NaCl + HCN↑. Kuita uku kunoratidza njodzi yakanyanyisa inosanganisirwa nesodium cyanide, sezvo kunyange shoma shoma yeasidhi inogona kukonzera kuburitswa kwegasi rinouraya rehydrogen cyanide.

Reaction Mechanism yeSodium Cyanide

Imwe yeanonyanyo zivikanwa maitiro ekuita anosanganisira sodium cyanide kushandiswa kwayo mukuumbwa kwesimbi, kunyanya mukubvisa simbi dzinokosha segoridhe nesirivha. Iyo nzira inozivikanwa se cyanidation. Pamberi peokisijeni nemvura, sodium cyanide inopindirana negoridhe muore kuumba goridhe rinonyungudika - cyanide complex. Mhedzisiro yese yekudonha kwegoridhe inogona kumiririrwa se: 4Au + 8NaCN + O₂ + 2H₂O → 4Na[Au(CN)₂] + 4NaOH.

Iyo michina inotanga neoxidation yegoridhe neokisijeni pamberi peiyo cyanide ions. Iwo cyanide ions anobva asungirira kune maion egoridhe ane oxidized, achigadzira yakagadzikana, mvura - soluble dicyanoaurate(I) yakaoma [Au(CN)₂]⁻. Uku kuomarara kuita kunonyungudisa goridhe, kuchibvumira kuti iparadzaniswe kubva kune ore matrix. Matanho anotevera anosanganisira kudzoreredzwa kwegoridhe kubva mugadziriso kuburikidza nenzira dzakasiyana, sekunaya ne zinc kana electrolysis.

Sodium cyanide inobatanidzwawo mukuita kuti nucleophilic substitution reactions iite. Cyanide anion (CN⁻) inyucleophile yakasimba nekuda kwekuvapo kwemaerekitironi maviri ari ega pa kabhoni atomu. Semuenzaniso, mumakemikari eorganic, inogona kuita ne alkyl halides (R - X, uko X iri halogen) mu SN₂ (bimolecular nucleophilic substitution) reaction yakajairika. General reaction scheme ndeiyi: R - X+ NaCN → R - CN + NaX. Mu reaction iyi, cyanide anion inorwisa carbon atomu yakabatana ne halogen kubva kumashure, ichibvisa halogen atomu uye ichigadzira carbon-carbon bond itsva mu nitrile product (R - CN). Iyi reaction inokosha zvikuru mukugadzirwa kwe organic compounds dzakasiyana-siyana, kusanganisira mishonga ne fine chemicals.

Mukuwedzera, sodium cyanide inogona kupinda hydrolysis mumvura. Iyo cyanide anion inopindirana nemamorekuru emvura kuita hydrogen cyanide uye hydroxide ions. Iyo hydrolysis maitiro ndeaya anotevera: CN⁻ + H₂O ⇌ HCN + OH⁻. Kuita uku kunodzokororwa uye kunokonzerwa nezvinhu zvakaita se pH. Mumhinduro dzakakosha, kuenzana kunoshandura kune zvinogadzirisa, kudzvinyirira kuumbwa kwehydrogen cyanide. Zvisinei, mumamiriro ezvinhu ane acidic kana asina kwaakarerekera, kuumbwa kweHCN kunonyanya kufarirwa, iyo inosimbisazve kudiwa kwekutonga pH kwakakodzera kana uchibata sodium cyanide solutions.

Chengetedzo uye Mafungiro Ezvakatipoteredza

Tichifunga nezve huturu hwayo hwakanyanya, mitemo yakasimba yekuchengetedza inofanirwa kuteverwa kana uchibata sodium cyanide. Vashandi vane chekuita nekugadzirwa kwayo, kufambisa, kana kushandiswa vanofanirwa kuve nemidziyo yekudzivirira yakafanira (PPE), kusanganisira magurovhosi, mamask, uye zvipfeko zvekudzivirira. Kana pakateuka kana kudonha, kuchengetedzwa nekukasira uye kusarerekera matanho kwakakosha. Kazhinji, sodium cyanide inogona kuderedzwa nekuita nayo neakasimba oxidizing agents, senge hypochlorite mhinduro, iyo inoshandura iyo cyanide ions kuita zvigadzirwa zvishoma zvine chepfu.

Kubva pakuona kwezvakatipoteredza, kusunungurwa kwe sodium cyanide mumhepo kunogona kuva nemigumisiro yakaoma. Sezvambotaurwa, kunyungudika kwayo mumvura kunoibvumira kusvibisa miviri yemvura, zvichiita ngozi kune zvipenyu zvemvura. Uyezve, kuumbwa kwehydrogen cyanide gasi kunogona kukanganisa hunhu hwemhepo iri padhuze nekuteuka. Naizvozvo, maindasitiri anoshandisa sodium cyanide anodiwa kuti aite kwakasimba marara manejimendi uye maitiro ekurapa kuti aderedze kukanganisa kwayo kwezvakatipoteredza.

Mukupedzisa, sodium cyanide isanganiswa ine yakasarudzika makemikari zvimiro uye akasiyana maitiro maitiro. Kunyange ichitamba mabasa akakosha mumaindasitiri akasiyana siyana, huturu hwayo hwakanyanyisa uye njodzi dzinogona kuitika kwezvakatipoteredza zvinoda kubata nekutarisira. Kuenderera mberi nekutsvagisa nekuvandudzwa kwedzimwe nzira dzakachengeteka uye nzira dzekurapa dzakanyanya kushanda dzesodium cyanide - inoenderana tsvina yakakosha kune inoenderera mberi maindasitiri maitiro.