Peb cog lus tias yuav muab cov nqi sib tw rau koj, cov khoom zoo kawg nkaus zoo heev, kuj tseem xa khoom sai rau Chaw Tsim Khoom ntawm Tuam Tshoj Muag 99.5% Propionic Acid CAS 79-09-4 nrog Lub Hoobkas Nqe, Txhua lub sijhawm, peb tau ua tib zoo saib xyuas txhua yam kom paub tseeb tias txhua yam khoom txaus siab los ntawm peb cov neeg siv khoom.
Peb cog lus tias yuav muab tus nqi sib tw rau koj, cov khoom zoo kawg nkaus, thiab xa khoom sai rau koj, Peb txoj cai ntawm Lub Tuam Txhab yog "zoo ua ntej, kom zoo dua thiab muaj zog dua, kev txhim kho ruaj khov". Peb lub hom phiaj yog "rau zej zog, cov neeg siv khoom, cov neeg ua haujlwm, cov neeg koom tes thiab cov lag luam kom nrhiav tau txiaj ntsig zoo". Peb lub hom phiaj yog koom tes nrog txhua lub tuam txhab tsim khoom siv tsheb, kho khoom, thiab tsim lub neej yav tom ntej zoo nkauj! Ua tsaug rau koj siv sijhawm los saib peb lub vev xaib thiab peb yuav txais tos txhua yam lus qhia uas koj muaj uas tuaj yeem pab peb txhim kho peb lub xaib.
Kev Tshawb Fawb Txog Cov Qauv Tshuaj Propionic Acid
Los ntawm qhov kev pom ntawm cov qauv molecular, propionic acid tus qauv CH₃CH₂COOH tuaj yeem tawg ua peb lub hauv paus tseem ceeb. Pawg methyl kawg (CH₃–) qhia txog cov yam ntxwv alkyl saturated, pawg methylene nruab nrab (–CH₂–) ua haujlwm ua ib chav txuas, thiab pawg carboxyl (–COOH) muab rau lub molecule nws cov yam ntxwv acidic ib txwm muaj. Qhov kev teeb tsa qauv no txhais tau tias propionic acid qhia txog ob qho tib si qee yam zoo li alkane thiab cov tshuaj carboxylic acid ib txwm muaj.
Nyob rau hauv qhov chaw, cov propionic acid molecule muaj ib qho yooj yim linear configuration. Lub C = O ob chav bond thiab -OH hydroxyl pawg hauv carboxyl pawg tsim ib tug coplanar qauv, thaum lub alkyl saw adopts ib tug tetrahedral geometry ntawm sp³ hybridization. Cov qauv no muab lub molecule nruab nrab polarity, piav qhia nws miscibility nrog dej thaum khaws cia compatibility nrog cov non-polar solvents xws li diethyl ether thiab chloroform.
Qhov tseem ceeb, cov carboxyl hydrogen hauv propionic acid ib feem dissociates hauv cov kua dej, tso tawm H⁺ ions thiab tsim cov propionate anions (CH₃CH₂COO⁻). Qhov kev sib cais no ua rau pKa ntawm 4.87 (ntawm 25 ° C), faib nws ua cov kua qaub tsis muaj zog. Cov cwj pwm acid-base no yog qhov tseem ceeb rau ntau yam ntawm nws daim ntawv thov, tshwj xeeb tshaj yog ua cov khoom noj khoom haus preservative, qhov twg nws cov qauv molecular undissociated tuaj yeem nkag mus rau hauv cov kab mob cell membranes zoo dua.