Normality vs Molarity
Molarity thiab normality yog ob qho tseem ceeb thiab feem ntau siv tshwm sim hauv chemistry. Ob lo lus yog siv los qhia qhov ntsuas qhov ntau ntawm cov khoom. Yog tias koj xav txiav txim siab tus nqi ntawm tooj liab ions hauv kev daws teeb meem, nws tuaj yeem muab raws li kev ntsuas ntsuas. Tag nrho feem ntau tag nrho cov kev suav tshuaj yog siv cov kev ntsuas concentration los txiav txim siab txog qhov sib tov. Txhawm rau txiav txim siab qhov concentration, peb yuav tsum muaj cov khoom sib xyaw ua ke. Txhawm rau xam qhov concentration ntawm txhua qhov sib xyaw, cov txheeb ze yaj hauv cov tshuaj yuav tsum paub. Concentration yog ib lo lus dav siv, thiab molarity thiab normality yog hom kev ntsuas concentration.
Nyob zoo
Raws li tau hais saum toj no qhov qub yog lwm txoj hauv kev qhia txog kev xav. "N" yog lub cim siv los qhia txog normality. Normality yog muab raws li qhov sib npaug ib liter. Qhov sib npaug yog tus naj npawb ntawm moles ntawm reactive units nyob rau hauv ib tug compound. Eq / L thiab mol / L yog cov units siv los qhia txog qhov qub. Piv txwv li, ib mole ntawm hydrogen chloride muab ib mole ntawm hydrogen ions thiab ib tug mole ntawm chloride ions rau hauv cov tshuaj. Ib mole ntawm hydrogen ions yog sib npaug rau ib qho sib npaug ntawm hydrogen ions. Yog li, 1M HCl yog tib yam li 1N HCL, tab sis thaum peb noj sulfuric acid, 1 mole ntawm sulfuric acids muab 2 moles ntawm hydrogen ions rau hauv cov tshuaj. Yog li ntawd, normality ntawm hydrogen ions yuav yog 2N rau ib tug sulfuric acid tov. Txhawm rau nkag siab ntxiv txog qhov qub, peb yuav siv cov tshuaj calcium chloride. Rau cov tshuaj chloride ions, qhov normality yog 2 N vim tias ib mole ntawm calcium chloride yields ob moles ntawm chloride ions. Rau calcium, valency yog +2. Yog li nws zoo li calcium tuaj yeem ua qhov chaw ntawm ob lub hydrogen ions. Yog li ntawd, nws qhov normality kuj yog 2.
Molarity
Molarity tseem hu ua molar concentration. Qhov no yog qhov piv ntawm tus naj npawb ntawm moles ntawm ib yam khoom hauv ib lub ntim ntawm cov kuab tshuaj. Conventionally, qhov hnyav ntim yog muab nyob rau hauv cubic meters. Txawm li cas los xij, rau peb txoj kev yooj yim peb feem ntau siv litres lossis cubic decimeters. Yog li, chav tsev ntawm molarity yog mol ib liter / cubic decimeter (mol l-1, mol dm-3). Chav tsev kuj tau qhia tias yog M. Piv txwv li, ib qho kev daws ntawm 1 mol ntawm sodium chloride yaj nyob rau hauv dej muaj ib tug molarity ntawm 1 M. Molarity yog feem ntau siv txoj kev concentration. Piv txwv li, nws yog siv nyob rau hauv lub xam ntawm pH, dissociation constants / equilibrium constants, thiab lwm yam. Conversion ntawm ib pawg ntawm ib tug muab solute rau nws molar tooj yuav tsum tau ua nyob rau hauv thiaj li yuav muab lub molar concentration thiab, ua li no, loj. muab faib los ntawm qhov hnyav molecular ntawm cov kua. Piv txwv li, yog xav npaj 1 M ntawm poov tshuaj sulfate tov, 174.26 g mol-1 (1 mol) ntawm poov tshuaj sulfate yuav tsum tau yaj hauv ib liter dej.
Dab tsi yog qhov txawv ntawm Normality thiab Molarity?
• Ib txwm muab raws li qhov sib npaug ntawm ib litre. Molarity yog muab raws li tus naj npawb ntawm moles ib liter.
• Ib txwm muab cov ntaub ntawv hais txog tus lej ntawm cov reactive units hauv ib liter ntawm cov tshuaj, whereas molarity muab cov ntaub ntawv hais txog tus naj npawb ntawm molecules nyob rau hauv ib liter ntawm tov.
• Ib txwm muaj peev xwm muab tau los ntawm molar concentration faib los ntawm qhov sib npaug.
