pH meter electrode tiv thaiv kev daws teeb meem
Lub npe tshuaj ntawm PH electrode tiv thaiv tshuaj potassium chloride yog KCL, nws qhov hnyav molecular=74.551 dawb crystalline hmoov los yog crystalline hmoov. Nws muaj iab thiab qab ntsev. Hygroscopic, kaw thiab khaws cia qhuav. Ib liters=1000 milliliters (1000ML) 3mol/L poov tshuaj chloride tov - uas yog hais, txhua liter ntawm cov tshuaj muaj 3 moles ntawm poov tshuaj chloride, mol (mole) yog ib tug stoichiometric chav tsev, thiab loj tus nqi ntawm txhua. Cov tshuaj mol yog sib npaug rau cov khoom Cov txheeb ze molecular mass ntawm 3mol / L KCl yog hais txog 223.5g KCl ib liter.
Yooj yim teeb tsa pH ntsuas|acidity meter tiv thaiv kev daws teeb meem - 3mol/L KCl tshuaj Expansion kauj ruam:
1. Kev suav: KCl molar mass yog 74.5g/mol, ces KCl hnyav =3mol × 74.5g/mol=223.5g;
2. Nyhav: Nyhav KCl 223.5g nrog kev ntsuas ntsuas, ua tib zoo saib xyuas kev siv qhov ntsuas ntsuas;
3. Dissolving: Dissolve tag nrho nrog 100ml distilled dej nyob rau hauv ib tug beaker, thiab do nrog ib tug iav pas nrig;
4. Hloov thiab ntxuav: hloov cov tshuaj yaj mus rau hauv 1000ml ntim ntim, thiab siv lub raj ntim ntim nrog lub qhov ncauj nqaim;
Lus Cim: Txhawm rau tiv thaiv cov tshuaj los ntawm kev nchuav, thiab tib lub sijhawm, tsis txhob cia cov tshuaj ntws mus rau hauv lub raj mis phab ntsa saum cov nplai kab, siv lub iav pas nrig rau cov kua dej. Txhawm rau kom ntseeg tau tias cov kua dej raug xa mus rau lub khob ntim ntim kom tiav raws li qhov ua tau, lub beaker thiab iav pas nrig yuav tsum tau ntxuav nrog dej distilled ob lossis peb zaug, thiab cov tshuaj tom qab txhua qhov ntxuav yuav tsum tau nchuav rau hauv lub khob ntim dej. Maj mam co lub khob ntim ntim kom sib tov kom huv si; (siv lub iav pas nrig rau cov kua dej)
5. Qhov ntim tsis tu ncua: Thaum ntxiv dej rau 2-3 cm ze rau ntawm qhov teev, siv cov roj hmab dropper los ntxiv cov dej distilled rau qhov teev. Qhov kev ua haujlwm no hu ua qhov ntim tas li. Thaum lub ntim tas li, ua tib zoo saib xyuas tias qhov qis tshaj plaws ntawm cov kua dej ntawm cov kua dej yog tangent mus rau qhov ntsuas kab, thiab qhov muag pom yog kab rov tav mus rau qhov ntsuas kab, thiab koj tsis tuaj yeem saib los yog saib, txwv tsis pub nws yuav ua rau yuam kev;
6. Co kom zoo: qhov concentration ntawm cov tshuaj tom qab lub ntim tas li tsis zoo li qub, lub cork ntawm lub ntim ntim yuav tsum tau nruj nreem ntsaws, thiab lub cork yuav tsum tau tuav nrog tus ntiv tes taw, thiab hauv qab ntawm lub raj mis tuaj yeem txhawb nqa. cov ntiv tes ntawm qhov tod tes, thiab lub khob ntim ntim yuav tsum tig rov qab thiab shaken ob peb zaug, kom sib tov cov tshuaj sib npaug. Qhov kev ua haujlwm no yog hu ua co;
7. Co cov tshuaj KCl tom qab ntim tas li. Ncuav cov tshuaj npaj rau hauv lub raj mis reagent, cap lub raj mis, thiab sau nws. Qhov no yog 3mol / L KCl tov.
Cov poov tshuaj chloride siv los ntub cov electrode tuaj yeem ua kua dej. Qhov yooj yim tshaj plaws yog ntxiv qee cov dej distilled (xws li 100g / los yog 100ml) rau hauv lub beaker, thiab tom qab ntawd ntxiv potassium chloride thaum nplawm kom txog thaum nws tsis tuaj yeem yaj ntxiv lawm. Potassium chloride yog suav tias yog saturated. Qhov concentration ntawm potassium chloride siv los ntub cov electrode yog 3mol / L. Raws li kev hloov dua siab tshiab, muaj 223.5 grams ntawm potassium chloride hauv 1000 mg ntawm cov tshuaj.
