Natural pH Indicators

Raws li kev cuam tshuam ntawm kev hloov pauv ntawm cov tshuaj tiv thaiv ib puag ncig, tsis yog tsuas yog cov khoom sib txuas siv hauv cov chaw soj ntsuam raws li cov ntsuas tau txais cov xim sib txawv. Ib pawg neeg coob sib npaug yog tsim los ntawm cov khoom muaj nyob hauv cov khoom ntuj tsim. Hauv ntau qhov kev sim, peb yuav sim tus cwj pwm ntawm pH ntsuas hauv peb ib puag ncig.

Rau kev sim, ntau qhov kev daws teeb meem nrog pH sib txawv yuav xav tau. Lawv tuaj yeem tau los ntawm diluting hydrochloric acid nrog HCl (pH 3-4% tov yog 0) thiab sodium hydroxide tov NaOH (4% kua muaj pH ntawm 14). Cov dej distilled, uas peb tseem yuav siv, muaj pH ntawm 7 (tsis nruab nrab). Hauv txoj kev tshawb no, peb yuav siv cov kua txiv beetroot, kua txiv hmab txiv ntoo liab, kua txiv blueberry thiab tshuaj yej infusion.

Hauv cov kav dej sim nrog cov kev daws teeb meem thiab cov dej distilled, poob me ntsis liab beet kua txiv (duab 1). Hauv cov tshuaj acidic, nws tau txais cov xim liab khaus, nyob rau hauv nruab nrab thiab alkaline daws, cov xim yuav xim av, tig mus rau hauv cov xim daj (duab 2). Cov xim kawg yog qhov tshwm sim ntawm decomposition ntawm cov dye nyob rau hauv ib tug muaj zog alkaline ib puag ncig. Cov tshuaj muaj lub luag haujlwm rau discoloration ntawm beetroot kua txiv yog betanin. Acidification ntawm borscht los yog beetroot zaub xam lav yog ua noj "chip" uas muab cov zaub mov rau cov xim appetizing.

Nyob rau hauv tib txoj kev, sim liab cabbage kua txiv (duab 3). Hauv cov kua qaub, cov kua txiv hmab txiv ntoo dhau los ua xim liab, hauv cov tshuaj nruab nrab nws dhau los ua ntshav liab, thiab hauv cov tshuaj alkaline nws yuav ntsuab. Tsis tas li ntawd nyob rau hauv cov ntaub ntawv no, lub hauv paus muaj zog decomposes cov xim - cov kua nyob rau hauv lub xeem raj yuav daj (duab 4). Cov khoom uas hloov xim yog anthocyanins. Sprinkling liab cabbage zaub xam lav nrog txiv qaub kua txiv muab nws ib tug txaus nyiam saib.

Lwm qhov kev sim xav tau cov kua txiv blueberry (duab 5). Cov xim liab-violet hloov mus rau xim liab hauv qhov nruab nrab acidic, mus rau ntsuab nyob rau hauv ib qho alkaline nruab nrab, thiab mus rau daj nyob rau hauv ib tug muaj zog alkaline nruab nrab (dye decomposition) (duab 6). Ntawm no, ib yam nkaus, anthocyanins yog lub luag haujlwm rau kev hloov xim ntawm cov kua txiv hmab txiv ntoo.

Tshuaj yej infusion kuj tseem siv tau los ua cov tshuaj pH ntsuas (duab 7). Nyob rau hauv lub xub ntiag ntawm acids, cov xim yog straw daj, nyob rau hauv ib tug nruab nrab nruab nrab nws ua lub teeb xim av, thiab nyob rau hauv ib tug alkaline nruab nrab nws yuav tsaus xim av (duab 8). Tannin derivatives yog lub luag hauj lwm rau hloov cov xim ntawm infusion, muab cov tshuaj yej nws tus yam ntxwv tart saj. Qhov sib ntxiv ntawm txiv qaub kua txiv ua rau cov xim ntawm infusion sib zog.

Nws kuj tseem tsim nyog rau nws tus kheej ua cov kev ntsuam xyuas nrog rau lwm yam kev ntsuas ntuj - ntau cov kua txiv hmab txiv ntoo thiab decoctions ntawm cov nroj tsuag hloov xim vim acidification lossis alkalization ntawm ib puag ncig.

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Natural pH Indicators