Mhinduro dzeBuffer: Kunzwisisa Mabasa Adzo uye Mashandisirwo Adzo muhupenyu hwezuva nezuva
Pendauluan
Mhinduro dzeBuffer zvikamu zvakakosha zvekemikari, zvichiita basa rakakosha mukutsvagisa murabhoritari uye kushandiswa kwezuva nezuva. Mhinduro dzeBuffer dzinochengetedza pH yakagadzikana mukati mehurongwa, kunyangwe kana acid kana mabhesi akawedzerwa. Muchinyorwa chino, tichaita ongororo yakadzama yenheyo dzekutanga dzemhinduro dzebuffer, mashandiro adzo, mhando dzemhinduro dzebuffer, uye mashandisirwo adzo muminda yakasiyana-siyana.
Nheyo Dzekutanga dzeBuffer Solutions
Mhinduro yebuffer inoumbwa nemusanganiswa weasidhi isina simba nechigadziko chayo che conjugate kana chigadziko chisina simba neasidhi yayo ye conjugate. Musimboti wekutanga wemhinduro yebuffer kugona kwayo kubvisa asidhi kana chigadziko chakawedzerwa kusystem, kuitira kuti pH yemhinduro irambe yakagadzikana mukati memimwe miganhu.
Maitiro eAcid-Base muBuffer Solutions
Kuti tinzwisise mashandiro anoita mhinduro dze "buffer", tinofanira kutarisa mhando mbiri dze "reactions": "acid addition reactions" uye "base addition reactions".
1. Kuwedzera Asidhi (H⁺):
– Asidhi asina simba ari mumhinduro dzebuffer anoparadzanisa zvishoma uye anoburitsa H⁺ ions ne conjugate base.
– Kana acid ikawedzerwa (kuwedzera H⁺), conjugate base ye weak acid ichaita zvakafanana neH⁺ ions yakawandisa kuti igadzire weak acid yakawanda, nokudaro ichideredza H⁺ yakawandisa uye ichichengetedza pH yakagadzikana.
2. Kuwedzera kweBase (OH⁻):
– Kana hwaro hwawedzerwa (kuwedzera OH⁻), ma OH⁻ ions achaita zvinoenderana nema H⁺ ions aripo, zvoita mvura.
– Zvadaro, asidhi isina simba ichawedzera kupatsanuka kuti itsive maH⁺ ions akarasika, kuitira kuti pH irambe yakagadzikana.
Kugona kweBuffer
Kugona kwebuffer chiyero chekuti acid kana base yakawanda sei inogona kuwedzerwa mubuffer solution usati wasangana nekuchinja kukuru mu pH. Kugona uku kunoenderana nehuwandu hwese hwezvikamu zvebuffer (asidi isina simba ne conjugate base yayo).
Range ye pH ye buffer
pH range iyo mhinduro yebuffer inoshanda zvakanyanya inowanzonzi "buffer zone." Iyi range inowanzova nepH unit imwe chete yakaderera pane pKa yeasidhi isina simba inoshandiswa mubuffer solution. Semuenzaniso, kana asidhi isina simba iine pKa ye4,7, mhinduro yebuffer inoshanda mu pH range 3,7 kusvika 5,7.
Mhando dzeBuffer Solutions
Mhinduro dzeBuffer dzinopatsanurwa zvichienderana nerudzi rweasidhi nehwaro hwadzinahwo. Heano marudzi maviri makuru emhinduro dzebuffer, pamwe chete nemienzaniso uye mashandisirwo adzo:
1. Chinovhara Asidhi:
– Zvikamu: Asidhi isina simba uye hwaro hwayo hwe conjugate.
– Muenzaniso: Mhinduro yeAcetate ine acetic acid (CH₃COOH) uye sodium acetate (CH₃COONa).
– Mashandisirwo: Inoshandiswa zvakanyanya mu biochemistry kuchengetedza pH yakagadzikana pa4-6.
2. Base Buffer:
– Zvikamu: Hwaro husina kusimba uye conjugate acid yayo.
– Muenzaniso: Mushonga weAmmonia une ammonia (NH₃) uye ammonium chloride (NH₄Cl).
– Mashandisirwo: Inoshandiswa mukushandiswa kunoda pH yakagadzikana yeinenge 9-11.
Zvishandiso zveBuffer Solution
Mhinduro dzeBuffer dzine mashandisirwo akasiyana-siyana, kubva kumarabhoritari emakemikari kusvika kuindasitiri yechikafu, hutano, uye nharaunda. Heano mamwe emashandisirwo makuru:
1. Kunyorera muSainzi dzeHutano
– Ropa: Ropa muenzaniso wemushonga wepanyama unokosha zvikuru. Sisitimu huru yemushonga muropa icarbonic acid-bicarbonate system, iyo inochengetedza pH yeropa revanhu inosvika 7,4. Kusawirirana mugadziriro iyi yemushonga kunogona kutungamira kuzvirwere zvakakomba zvakaita seacidosis uye alkalosis.
– Mishonga: Mishonga yakawanda inochengetwa mumhinduro dzekudzivirira chirwere kuti irambe yakasimba uye ichishanda zvakanaka. Semuenzaniso, mhinduro dzekudzivirira chirwere dzinoshandiswa mumajekiseni kuti dzirambe dzakasimba.
2. Mashandisirwo muBazi reMaindasitiri
– Indasitiri Yezvekudya: Muindasitiri yezvekudya, mishonga yekudzivirira inoiswa muzvinwiwa zvinoshandiswa kudzora pH yezvikafu panguva yekugadzira nekuchengetedza. Semuenzaniso, mishonga yekudzivirira inowedzerwa muzvigadzirwa zvemukaka kuchengetedza pH yakakodzera uye kudzivirira kuora.
– Kugadzira Mapepa: Panguva yekugadzira mapepa, mishonga inoshandiswa kudzora pH yepepa rekuisa pepa kuitira kuti shinda dzisakuvadzwe panguva yekugadzira.
3. Mashandisirwo Mumunda weKutsvagisa
– Biochemistry: Mhinduro dzebuffer dzakakosha mukutsvagisa kwebiochemical. Dzinoshandiswa mukuyedza kwakasiyana-siyana kwema enzymes kuchengetedza pH yakakwana inodiwa nema enzymes kuti ashande zvakanyanya.
– Gel Electrophoresis: Munzira yegel electrophoresis, iyo inoshandiswa pakupatsanura DNA, RNA, uye mapuroteni, mushonga webuffer unoshandiswa kuchengetedza pH isingachinji mukati mekuita uku.
4. Mashandisirwo muKudzivirirwa Kwezvakatipoteredza
– Kurapa Mvura Yakasviba: Mukurapa mvura yakasviba, mishonga yekudzivirira inoshandiswa kugadzirisa pH yemvura kuitira kuti nzira yekuparadzanisa tsvina ishande zvakanaka uye kudzivirira kukuvara kwehurongwa hwekurapa.
– Kudzora Kusvibiswa Kwemhepo: Mhinduro dzebuffer dzinoshandiswa mumachimini emaindasitiri kuderedza magasi ane acid anokuvadza asati aburitswa mumhepo.
Mhedziso
Mhinduro dze "buffer solutions" dzinoita basa rakakosha muhupenyu, mune zvesainzi uye mumashandisirwo anoitwa zuva nezuva. Nekunzwisisa misimboti yekutanga, mhando, uye mashandisirwo e "buffer solutions", tinogona kunzwisisa zviri nani kukosha kwekuchengetedza pH yakagadzikana mumakemikari akasiyana-siyana uye zvipenyu.
Mashandiro akasiyana-siyana uye mabhenefiti emhinduro dzekubatsira anoratidza kukosha kweruzivo urwu kumarudzi akasiyana-siyana, kubva kumishonga kusvika kumaindasitiri. Nokudaro, kunzwisisa mhinduro dzekubatsira chinhu chakakosha chinobatsira kwete masayendisiti nevaongorori chete asiwo nharaunda yakakura muhupenyu hwezuva nezuva.
