General reagents yog dab tsi?
General reagents yog cov tshuaj lom neeg uas feem ntau siv nyob rau hauv ntau yam kev kuaj thiab kev sim. Cov reagents no hu ua "general" vim hais tias lawv tuaj yeem siv rau ntau lub hom phiaj hauv kev sib txawv ntawm kev tshawb fawb, xws li chemistry, biology, thiab biochemistry. Lawv yog cov khoom siv ntau yam thiab tseem ceeb ntawm ntau cov haujlwm tshawb fawb thiab cov txheej txheem tshuaj xyuas.
Kev faib tawm ntawm General Reagents
General reagents tuaj yeem muab faib ua ntau pawg raws li lawv cov yam ntxwv thiab kev siv. Qee yam khoom muaj xws li acids, bases, solvents, indicators, As buffers, oxidizing agents, reduce agents, and complexing agents.
Cov kua qaub
Acids yog cov khoom uas tuaj yeem pub cov hydrogen ions (H +) hauv cov tshuaj tiv thaiv tshuaj. Lawv feem ntau yog qaub hauv saj thiab tuaj yeem corrode hlau thiab hlawv tawv nqaij. Hauv chav kuaj, cov kua qaub feem ntau yog siv hauv kev sim titration, hloov pH, thiab ua catalysts. Piv txwv ntawm cov kua qaub xws li hydrochloric acid (HCl), sulfuric acid (H2SO4), thiab acetic acid (CH3COOH).
Bases
Bases yog cov khoom uas tuaj yeem txais hydrogen ions (H +) hauv cov tshuaj tiv thaiv tshuaj. Lawv feem ntau iab nyob rau hauv saj thiab muaj ib tug soapy los yog nplua zoo nkauj. Zoo ib yam li cov kua qaub, cov hauv paus tau siv dav hauv ntau cov txheej txheem kuaj xws li titration, pH hloov kho, thiab ua catalysts. Cov hauv paus muaj xws li sodium hydroxide (NaOH), potassium hydroxide (KOH), thiab ammonium hydroxide (NH4OH).
Cov kuab tshuaj
Cov kuab tshuaj yog cov kua dej uas tuaj yeem yaj, tawg, lossis rho tawm lwm yam khoom. Lawv siv los tsim cov kev daws teeb meem, yaj cov tebchaw, lossis muab qhov nruab nrab tsim nyog rau cov tshuaj tiv thaiv. Cov kuab tshuaj muaj xws li dej, ethanol, acetone, thiab toluene. Kev xaiv cov kuab tshuaj yog nyob ntawm qhov solubility ntawm cov khoom siv thiab cov kev cai tshwj xeeb ntawm kev sim.
Qhov taw qhia
Cov ntsuas yog cov khoom uas hloov xim nyob ntawm pH ntawm cov tshuaj uas lawv ntxiv rau. Lawv feem ntau siv hauv kev sim titration los txiav txim qhov kawg ntawm cov tshuaj tiv thaiv. Qee qhov ntsuas tau paub zoo suav nrog phenolphthalein, bromothymol xiav, thiab litmus ntawv.
Buffers
Buffers yog cov kev daws teeb meem uas pab tswj tus nqi pH ruaj khov los ntawm kev tiv thaiv kev hloov hauv acidity lossis alkalinity. Lawv yog tsim los ntawm ib tug tsis muaj zog acid thiab nws conjugate puag los yog ib tug tsis muaj zog puag thiab nws conjugate acid. Buffers yog qhov tseem ceeb hauv ntau yam kev sim tshuaj biochemical thiab molecular biology, vim lawv muab ib puag ncig tswj kev cuam tshuam thiab pab tswj kev ruaj ntseg ntawm cov qauv lom.
Oxidizing Agents
Oxidizing agents yog cov khoom uas ua rau lwm yam khoom poob electrons hauv cov tshuaj tiv thaiv. Lawv feem ntau siv los oxidize cov organic tebchaw los yog txiav txim seb muaj cov tshuaj txo cov tshuaj tiv thaiv. Cov tshuaj oxidizing feem ntau suav nrog potassium permanganate (KMnO4), hydrogen peroxide (H2O2), thiab chromic acid (H2CrO4).
Txo Cov Neeg Sawv Cev
Cov tshuaj txo qis yog cov khoom uas ua rau lwm yam khoom tau txais electrons hauv cov tshuaj tiv thaiv tshuaj. Lawv yog siv nyob rau hauv ntau yam txo cov tshuaj tiv thaiv thiab tuaj yeem ua hauj lwm los xyuas qhov muaj cov tshuaj oxidizing. Cov tshuaj txo qis xws li sodium borohydride (NaBH4), zinc (Zn), thiab hydrochloric acid (HCl).
Cov neeg ua haujlwm nyuaj
Complexing agents yog cov khoom uas tsim cov complexes ruaj khov los yog kev sib koom ua ke nrog cov hlau ions. Lawv yog siv los txhim kho cov solubility ntawm cov hlau ions, tiv thaiv nag lossis daus, los yog pab txhawb kev cuam tshuam tshwj xeeb. Cov neeg ua haujlwm sib xyaw ua ke suav nrog ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DPTA), thiab dimethylglyoxime.
Kev siv ntawm General Reagents
General reagents yog qhov tseem ceeb hauv chav kuaj thiab siv ntau yam kev siv. Qee qhov kev siv ntau tshaj suav nrog:
- Kev tshuaj xyuas tshuaj: General reagents yog siv los txiav txim qhov muaj pes tsawg leeg, qauv, thiab cov khoom ntawm ntau yam khoom. Lawv yog cov tseem ceeb hauv cov txheej txheem xws li titration, colorimetry, spectroscopy, chromatography, thiab electrochemistry.
- Organic synthesis: General reagents yog qhov tseem ceeb hauv cov organic chemistry rau kev tsim cov tebchaw tshiab, pab pawg ua haujlwm, thiab polymers. Lawv pab txhawb kev tshwm sim xws li esterification, oxidation, txo, condensation, thiab hydrolysis.
- Kev soj ntsuam biochemical: Hauv kev tshawb fawb txog roj ntsha, cov tshuaj reagents yog siv los kawm thiab tshuaj xyuas cov qauv tshuaj lom neeg. Lawv yog cov khoom tseem ceeb hauv cov txheej txheem xws li kev soj ntsuam enzyme, DNA sequencing, protein purification, thiab cell staining.
- Kev Tswjhwm Zoo: Cov tshuaj reagents yog ua haujlwm hauv kev lag luam los xyuas kom meej cov khoom zoo thiab kev nyab xeeb. Lawv yog siv los kuaj thiab xyuas qhov purity, muaj pes tsawg leeg, thiab kev ua tau zoo ntawm ntau yam khoom.
Kev xav txog kev nyab xeeb
Txawm hais tias cov tshuaj reagents yog qhov tseem ceeb hauv cov txheej txheem kuaj, nws yog ib qho tseem ceeb uas yuav tau saib xyuas lawv thiab ua raws li cov txheej txheem kev nyab xeeb tsim nyog. Qee cov reagents tej zaum yuav corrosive, lom, flammable, los yog reactive. Nws yog ib qho tseem ceeb uas yuav tsum tau hnav cov cuab yeej tiv thaiv tsim nyog, xws li hnab looj tes, tsom iav, thiab cov tsho hauv chav kuaj, thiab ua haujlwm hauv qhov chaw muaj cua zoo. Kev khaws cia, tuav, thiab pov tseg txoj kev tsim nyog yuav tsum tau ua raws li kom txo qis kev pheej hmoo ntawm kev raug xwm txheej lossis kev phom sij ib puag ncig.
Hauv kev xaus, cov tshuaj reagents yog cov cuab yeej tseem ceeb hauv kev sim thiab kev tshawb fawb. Lawv yog ntau yam sib txuas uas pom cov ntawv thov hauv ntau yam kev qhuab qhia. Kev nkag siab txog lawv cov khoom, kev faib tawm, thiab cov ntawv thov yog qhov tseem ceeb rau kev sim ua tiav thiab ua tiav cov txiaj ntsig raug. Los ntawm kev siv cov tshuaj reagents kom zoo, cov kws tshawb fawb tuaj yeem ua tiav lawv txoj kev nkag siab ntawm lub ntiaj teb tshuaj lom neeg thiab lom neeg thiab pab txhawb rau kev kawm txuj ci.