Cov txheej txheem:
Video: Yuav ua li cas thiaj ua tau 20% qabzib tov?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Txheej txheem
- Ntsuas 1.5L ntawm DI dej rau hauv 2L lub raj mis ntawm cov phaj kub.
- Ntxiv do bar thiab pib spinning.
- Txiav tawm 400g ntawm qabzib hmoov
- Do kom txog thaum yaj.
- Nqa tag nrho ntim mus txog 2L siv thib ob kawm tiav lub tog raj kheej.
- Ntxiv rov qab rau lub khob rau kev sib tov.
- Ntxiv 100 ml ntawm kua qab zib tov rau hauv 20 100ml iav fwj.
Hais txog qhov no, koj yuav ua li cas 1% cov kua qabzib?
Txhawm rau ua haujlwm ntau npaum li cas qabzib koj xav tau ua a daws ntawm qhov muab feem pua, sib npaug (pawg/ntim) los ntawm ntim, ua raws li qhov xav tau 1 g hauv 100 ml yog 1 feem pua daws . Rau qhov piv txwv no, yog koj xav tau ua tag nrho daws 500 ml ntawm 20 feem pua qabzib , sib npaug (20/100) los ntawm 500.
Ib tus kuj tseem yuav nug tias, 20% daws yog dab tsi? 20 % los ntawm pawg txhais tau tias 20 g ntawm NaOH yog yaj nyob rau hauv 100 g ntawm daws . Dab tsi yog lub ntsiab lus ntawm 20 % pawg los ntawm ntim daws ? 20 % huab hwm coj los ntawm ntim txhais tau tias 20 g ntawm NaOH yog yaj hauv 100 mL ntawm daws.
Hais txog qhov no, koj yuav ua li cas thiaj daws tau cov piam thaj?
Txheej txheem
- Nyhav tawm 20g cov piam thaj (dextrose)
- Ntxiv rau 70 ml ntawm H2O.
- Dissolve los ntawm stirring. Tej zaum yuav siv qee qhov cua sov.
- Thaum cov piam thaj tau yaj, nqa qhov ntim ntawm qhov sib tov mus txog 100ml tag nrho.
- Autoclave.
Koj yuav ua li cas 10% sucrose tov?
Dissolve 10 grams qab zib hauv 80 ml dej. Tom qab lub qab zib yog yaj tag, kho qhov ntim rau 100 ml. 10 % qab zib thiab 90% dej los ntawm huab hwm coj.
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