Qhov sib txawv tseem ceeb ntawm tus nqi ntawm cov kua qaub thiab tus nqi saponification yog cov kua qaub uas muab cov poov tshuaj hydroxide loj uas yuav tsum tau ua kom tsis muaj zog ib gram ntawm cov tshuaj lom neeg thaum tus nqi saponification muab qhov loj ntawm potassium hydroxide yuav tsum tau saponify ib gram ntawm rog.
Txawm hais tias tus nqi ntawm cov kua qaub thiab tus nqi saponification txawv ntawm ib leeg, ob qho tib si cov txiaj ntsig tau muab los ua ib pawg (ntawm potassium hydroxide). Ntxiv mus, cov ntsiab lus no muab tus nqi nyob rau hauv milligrams.
Acid nqi yog dab tsi?
Acid tus nqi yog qhov loj hauv milligrams ntawm poov tshuaj hydroxide uas yuav tsum tau ua kom tsis muaj zog ib gram ntawm cov tshuaj lom neeg. Hauv lwm lo lus, tus nqi no txiav txim siab tus nqi ntawm cov kua qaub hauv cov khoom. Feem ntau, tus nqi no yog siv los ntsuas tus nqi ntawm cov carboxylic acid pawg hauv cov tshuaj lom neeg - E.g. fatty acid.
Kev txiav txim siab ntawm tus nqi kua qaub suav nrog kev ua kom tiav tus nqi ntawm cov qauv hauv cov kuab tshuaj organic (feem ntau peb siv isopropanol ua cov kuab tshuaj) ua raws li titration nrog cov tshuaj potassium hydroxide. Ntawm no, cov tshuaj poov tshuaj hydroxide yuav tsum muaj kev paub ntau ntxiv, thiab qhov taw qhia rau qhov titration no yog phenolphthalein. Kev hloov xim yog xim tsis muaj xim rau paj yeeb.
Daim duab 01: Xim hloov ntawm qhov kawg ntawm Titration
Tus lej kua qaub tuaj yeem siv los ntsuas cov kua qaub ntawm cov khoom xws li biodiesel. Cov tshuaj sib npaug rau qhov kev txiav txim siab no yog raws li hauv qab no: Veq yog qhov ntim ntawm potassium hydroxide xav tau rau titration uas cuam tshuam nrog cov qauv thiab 1 mL ntawm cov tshuaj spiking ntawm qhov sib npaug, b eq yog qhov ntim ntawm titrant reacted nrog 1 mL ntawm cov tshuaj spiking ntawm qhov sib npaug.56.1 g / mol yog cov molar loj ntawm poov tshuaj hydroxide, thiab Wroj yog qhov loj ntawm cov qauv hauv grams.
AN=(Veq – beq)N{56.1/ Woil}
Saponification Value yog dab tsi?
Saponification tus nqi yog qhov loj hauv milligrams ntawm poov tshuaj hydroxide yuav tsum tau saponify ib gram ntawm cov rog nyob rau hauv tej yam kev mob. Tus nqi no ntsuas qhov nruab nrab molecular hnyav ntawm tag nrho cov fatty acids tam sim no nyob rau hauv ib tug qauv.
Daim duab 02: Saponification
Tus nqi no tso cai rau peb los sib piv qhov nruab nrab fatty acid saw ntev. Qhov tseeb, tus nqi no txiav txim siab npaum li cas ntawm cov carboxylic acid pawg ntawm cov roj fatty acid. E.g. tus nqi qis saponification ntawm qee cov rog qhia tau hais tias cov rog no muaj tsawg dua cov carboxylic ua haujlwm pab pawg hauv ib chav tsev ntawm cov rog uas piv rau cov roj ntsha luv luv.
Qhov txawv ntawm Acid Tus Nqi thiab Tus Nqi Saponification yog dab tsi?
Acid tus nqi thiab tus nqi saponification yog pawg. Qhov sib txawv tseem ceeb ntawm tus nqi ntawm cov kua qaub thiab tus nqi saponification yog tias cov kua qaub muab qhov loj ntawm cov poov tshuaj hydroxide uas yuav tsum tau ua kom tsis muaj zog ntawm ib gram ntawm cov tshuaj lom neeg thaum saponification tus nqi muab qhov loj ntawm cov poov tshuaj hydroxide yuav tsum tau saponify ib gram roj. Yog li ntawd, acid tus nqi txiav txim siab acidity ntawm ib yam khoom thaum tus nqi saponification txiav txim siab npaum li cas ntawm ester linkages nyob rau hauv ib tug rog.
Hauv qab infographic qhia txog qhov sib txawv ntawm tus nqi kua qaub thiab tus nqi saponification.
Summary – Acid Value vs Saponification Value
Acid tus nqi thiab tus nqi saponification yog pawg. Qhov sib txawv tseem ceeb ntawm tus nqi ntawm cov kua qaub thiab tus nqi saponification yog tias tus nqi kua qaub muab qhov loj ntawm cov poov tshuaj hydroxide uas yuav tsum tau ua kom tsis muaj zog ib gram ntawm cov tshuaj lom neeg thaum tus nqi saponification muab qhov loj ntawm cov poov tshuaj hydroxide yuav tsum tau saponify ib gram roj.
