Qhov sib txawv tseem ceeb ntawm benzoic acid thiab sodium benzoate yog tias benzoic acid yog qhov yooj yim tshaj plaws aromatic carboxylic acid whereas sodium benzoate yog sodium ntsev ntawm benzoic acid.
Benzoic acid yog ib qho tshuaj tsw qab carboxylic acid thiab sodium benzoate yog ib qho derivative ntawm no benzoic acid. Ob leeg no yog cov organic tebchaw vim hais tias ob qho tib si cov tebchaw muaj lub nplhaib benzene, hloov nrog ib pawg carbonyl.
YDab tsi yog Benzoic Acid
Benzoic acid yog qhov yooj yim tshaj plaws aromatic carboxylic acid. Cov mis molecular ntawm benzoic acid yog C6H5COOH. Cov molar loj ntawm benzoic acid yog hais txog 122.12 g / mol. Ib qho benzoic acid molecule yog tsim los ntawm ib lub nplhaib benzene hloov nrog ib pawg carboxylic acid (-COOH).
Daim duab 01: Benzoic Acid Crystals
Nyob rau hauv chav tsev kub thiab siab, benzoic acid yog dawb crystalline khoom. Nws yog me ntsis soluble hauv dej. Benzoic acid muaj qhov tsw qab ntxiag. Lub melting point ntawm benzoic acid yog hais txog 122.41 ° C. Qhov kub ntawm benzoic acid yog 249.2 ° C, tab sis ntawm 370 ° C, nws decomposes.
Benzoic acid tuaj yeem hloov pauv hluav taws xob uas muaj ntxhiab tsw qab vim yog cov khoom siv hluav taws xob rho tawm ntawm pawg carboxylic. Carboxylic acid tuaj yeem muab lub nplhaib aromatic nrog pi electrons. Tom qab ntawd nws yuav nplua nuj nyob rau hauv electrons. Yog li ntawd, electrophiles tuaj yeem hnov mob nrog lub nplhaib uas muaj ntxhiab.
Benzoic acid yog cov kab mob fungistatic uas tau siv dav los ua zaub mov noj. Qhov no txhais tau tias nws tuaj yeem tiv thaiv kev loj hlob ntawm fungi hauv cov zaub mov. Benzoic acid tuaj yeem pom muaj nyob hauv qee cov txiv hmab txiv ntoo xws li berries.
Sodium Benzoate yog dab tsi?
Sodium benzoate yog sodium ntsev ntawm benzoic acid muaj cov tshuaj formula C6H5COONa. Peb tuaj yeem tsim nws los ntawm kev ua haujlwm nruab nrab ntawm benzoic acid. Txoj kev tsim khoom no suav nrog cov tshuaj tiv thaiv ntawm sodium hydroxide thiab benzoic acid. Tab sis, kev lag luam, peb tuaj yeem tsim nws los ntawm ib nrab oxidation ntawm toluene nyob rau hauv lub xub ntiag ntawm oxygen. Feem ntau, sodium benzoate muaj nyob hauv ntau cov khoom noj nrog rau benzoic acid. Qee qhov chaw nplua nuj yog cov zaub thiab txiv hmab txiv ntoo. Daim ntawv thov tseem ceeb ntawm qhov sib xyaw no yog nws siv ua zaub mov preservative.
Daim duab 02: Sodium Benzoate
Sodium benzoate muaj cov molar loj 144 g / mol. Nws zoo nkaus li cov hmoov dawb crystalline thiab nws tsis muaj ntxhiab tsw. Lub melting point ntawm no compound yog 410 ° C.
Qhov txawv ntawm Benzoic Acid thiab Sodium Benzoate yog dab tsi?
Qhov sib txawv tseem ceeb ntawm benzoic acid thiab sodium benzoate yog benzoic acid yog qhov yooj yim tshaj plaws aromatic carboxylic acid whereas sodium benzoate yog sodium ntsev ntawm benzoic acid. Txawm li cas los xij, ob qho tib si no yog cov organic tebchaw vim tias ob lub tebchaw no muaj lub nplhaib benzene, hloov nrog ib pawg carbonyl.
Ntxiv mus, benzoic acid tsis zoo dej-soluble nyob rau hauv chav tsev kub, tab sis yog hais tias peb sov lub compound nws ua ntau dej-soluble; Txawm li cas los xij, sodium benzoate yog dej-soluble ntawm chav tsev kub. Yog li, qhov no yog lwm qhov sib txawv ntawm benzoic acid thiab sodium benzoate.
Lub melting point ntawm benzoic acid yog hais txog 122.41 ° C. Tab sis rau sodium benzoate, lub melting point yog tus nqi siab heev - 410 ° C. Tsis tas li ntawd, ob lub tebchaw no tshwm sim li dawb crystalline solids, tab sis benzoic acid zoo nkaus li cov qauv zoo li rab koob thaum sodium benzoate feem ntau yog hmoov. Ob lub tebchaw no tseem ceeb ua zaub mov noj.
Summary – Benzoic Acid vs Sodium Benzoate
Qhov sib txawv tseem ceeb ntawm benzoic acid thiab sodium benzoate yog benzoic acid yog qhov yooj yim tshaj plaws aromatic carboxylic acid whereas sodium benzoate yog sodium ntsev ntawm benzoic acid. Ob leeg no yog cov organic tebchaw vim hais tias ob qho tib si cov tebchaw muaj lub nplhaib benzene, hloov nrog ib pawg carbonyl.
