I-Sodium Cyanide: Isingeniso Sezici Zayo Zekhemikhali kanye Nezindlela Zokusabela

Sodium i-cyanide (I-NaCN) iyinhlanganisela ebaluleke kakhulu ye-inorganic enezinhlobonhlobo zezinhlelo zokusebenza kuzo zonke izimboni ezihlukahlukene, kodwa futhi idume kabi ngobuthi bayo obudlulele. Ukuqonda yayo Izakhi ze-Chemical kanye nezindlela zokusabela zibalulekile ekuphathweni okuphephile, ukusetshenziswa ngempumelelo, kanye Ukuvikelwa kwemvelo. Lokhu okuthunyelwe kwebhulogi kuhlose ukunikeza umbono obanzi walezi zici.

Izakhiwo Zamakhemikhali ze-Sodium Cyanide

I-sodium cyanide iwuketshezi olumhlophe, oluyikristalu oluncibilika kakhulu emanzini, lwakha isixazululo se-alkaline esinamandla. Ukuncibilika kwayo emanzini kubangelwa i-ionic yenhlanganisela. Esimeni esiqinile, i-NaCN iqukethe ama-sodium cations (Na⁺) nama-cyanide anions (CN⁻) ahlanganiswe ndawonye ngamabhondi e-ionic. Lapho encibilika emanzini, la ma-ion ayahlukana, okuvumela inhlanganisela ukuthi incibilike kalula. Inqubo yokuqedwa ingamelwa isibalo: NaCN(ama) → Na⁺(aq) + CN⁻(aq).

Lokhu kuncibilika kunikeza i-Sodium cyanide ukuhamba okuphezulu ezindaweni ezinamanzi, okunezinzuzo ezisebenzayo kanye nemiphumela emvelweni. Isibonelo, ekumbiweni kwegolide, ukuncibilika kwe-NaCN kwenza ukuthi yakhe ama-complex ane-ioni zegolide, okwenza kube lula ukukhipha igolide ku-ore. Kodwa-ke, kusho nokuthi uma ingaphathwa kahle, i-Sodium Cyanide ingangcolisa imithombo yamanzi kalula.

Ngokuphathelene nezakhiwo zomzimba, i-sodium cyanide inezinga lokuncibilika eliphakeme kakhulu elingu-563.7 °C kanye nezinga lokubilisa elingu-1496 °C. Lawa mazinga okuncibilika nokubilisa aphezulu ayisici sama-ionic compounds, adinga amandla amaningi ukuze aphule izibopho eziqinile ze-ionic ezibamba ama-ion ndawonye.

Enye impahla ebalulekile yamakhemikhali ye-sodium cyanide ukuphinda isebenze nama-acids. Lapho i-sodium cyanide ihlangana nama-asidi, isabela ngokushesha yenze i-hydrogen cyanide (HCN), igesi enobuthi obunamandla futhi eshintshashintshayo. Ukusabela nge-asidi eqinile, njenge-hydrochloric acid (HCl), ingabhalwa ngokuthi: NaCN + HCl → NaCl + HCN↑. Lokhu kusabela kugqamisa ingozi enkulu ehlobene ne-sodium cyanide, njengoba ngisho nenani elincane le-asidi lingabangela ukukhululwa kwegesi ebulalayo ye-hydrogen cyanide.

Izindlela zokusabela ze-Sodium Cyanide

Enye yezindlela ezaziwa kakhulu zokusabela ezibandakanya i-sodium cyanide ukusetshenziswa kwayo ekuhlanganiseni kwensimbi, ikakhulukazi ekukhishweni kwezinsimbi eziyigugu njengegolide nesiliva. Inqubo yaziwa ngokuthi i-cyanidation. Lapho kukhona umoya-mpilo kanye namanzi, i-sodium cyanide ihlangana negolide ku-ore ukuze yakhe inkimbinkimbi yegolide encibilikayo - i-cyanide. Ukusabela sekukonke kokucwiliswa kwegolide kungamelwa njengokuthi: 4Au + 8NaCN + O₂ + 2H₂O → 4Na[Au(CN)₂] + 4NaOH.

Umshini uqala ngokufakwa kwegolide nge-oxygen lapho kukhona ama-ion e-cyanide. Ama-ion e-cyanide abe esebophezela kuma-ion egolide ane-oxidized, akhe inxanxathela ye-dicyanoaurate(I) ezinzile, yamanzi - encibilikayo [Au(CN)₂]⁻. Lokhu kusabela okuyinkimbinkimbi kunyibilikisa ngempumelelo igolide, likuvumela ukuthi lihlukaniswe ne-matrix ye-ore. Izinyathelo ezilandelayo zibandakanya ukutholwa kwegolide esixazululweni ngezindlela ezihlukahlukene, njengemvula enezinki noma i-electrolysis.

I-Sodium cyanide ibamba iqhaza ekuphenduleni kokushintshana kwe-nucleophilic. I-cyanide anion (CN⁻) iyi-nucleophile enamandla ngenxa yokuba khona kwe-electron eyodwa ku- athomu ye-Carbon . Ku-chemistry yezinto eziphilayo, isibonelo, ingasabela ne-alkyl halides (R - X, lapho i-X iyi-halogen) ku-SN₂ ejwayelekile (i-bimolecular nucleophilic substitution). Uhlelo lokuphendula olujwayelekile luyi: R - X+ NaCN → R - CN + NaX. Kulokhu kusabela, i-cyanide anion ihlasela i-athomu yekhabhoni eboshwe ne-halogen isuka ngemuva, isusa i-athomu ye-halogen futhi yakhe isibopho esisha sekhabhoni nekhabhoni kumkhiqizo we-nitrile (R - CN). Lokhu kusabela kubaluleke kakhulu ekuhlanganisweni kwamakhemikhali ahlukahlukene ezinto eziphilayo, okuhlanganisa nemithi kanye namakhemikhali amahle.

Ngaphezu kwalokho, i-sodium cyanide ingaba ne-hydrolysis emanzini. I-cyanide anion ihlangana nama-molecule amanzi ukuze yakhe i-hydrogen cyanide nama-ion hydroxide. Ukusabela kwe-hydrolysis kungokulandelayo: CN⁻ + H₂O ⇌ HCN + OH⁻. Lokhu kusabela kuyabuyiseleka emuva futhi kuthonywa izici ezifana ne-pH. Ezixazululweni eziyisisekelo, ukulingana kushintshela kuma-reactants, kucindezela ukwakheka kwe-hydrogen cyanide. Kodwa-ke, ezimweni ezine-acidic noma ezingathathi hlangothi, ukwakheka kwe-HCN kuhle kakhulu, okuphinda kugcizelele isidingo sokulawula i-pH efanele lapho kusingathwa izixazululo ze-sodium cyanide.

Ukucatshangelwa kokuphepha kanye nemvelo

Njengoba kubhekwa ubuthi bayo obuphezulu, izimiso zokuphepha eziqinile kufanele zilandelwe lapho kusingathwa i-sodium cyanide. Abasebenzi abathintekayo ekukhiqizweni kwayo, ekuthuthweni, noma ekusetshenzisweni kwayo kufanele bahlonyiswe ngezinto ezifanele zokuzivikela (i-PPE), okuhlanganisa amagilavu, imaski, nezingubo zokuzivikela. Esimeni sokuchitheka noma ukuvuza, ukunqanda ngokushesha kanye nezinyathelo zokunciphisa zibalulekile. Imvamisa, i-sodium cyanide ingancishiswa ngokuyiphendula ngama-oxidizing agents aqinile, njengezixazululo ze-hypochlorite, eziguqula ama-ion e-cyanide abe imikhiqizo enobuthi obuncane.

Ngokombono wemvelo, ukukhululwa kwe-sodium cyanide endaweni ezungezile kungaba nemiphumela emibi. Njengoba kushiwo ngaphambili, ukuncibilika kwayo emanzini kuyivumela ukuba ingcolise imizimba yamanzi, kube usongo ezintweni eziphilayo zasemanzini. Ngaphezu kwalokho, ukwakheka kwegesi ye-hydrogen cyanide kungase futhi kuthinte izinga lomoya endaweni yokuchitheka. Ngakho-ke, izimboni ezisebenzisa i-sodium cyanide zidingeka ukuthi zisebenzise ukulawulwa kwemfucuza eqinile kanye nezinqubo zokwelashwa ukuze kuncishiswe umthelela wayo kwezemvelo.

Sengiphetha, i-sodium cyanide iyinhlanganisela enezici zamakhemikhali ezihlukile kanye nezindlela ezihlukahlukene zokusabela. Nakuba idlala indima ebalulekile ezinqubweni ezehlukene zezimboni, ubuthi bayo obudlulele kanye nezingozi ezingaba khona zemvelo zidinga ukuphathwa nokuphathwa ngokucophelela. Ucwaningo oluqhubekayo nokuthuthukiswa kwezinye izindlela eziphephile nezindlela zokwelashwa ezisebenza kahle kakhulu zemfucuza ehlobene ne-sodium cyanide kubalulekile ekusebenzeni okuzinzile kwezimboni.