N'chifukwa chiyani phenol wofiira anasanduka pinki?
N'chifukwa chiyani phenol wofiira anasanduka pinki?
Anonim

Pamwamba pH 8.2, phenol wofiira amatembenukira chowala pinki (fuchsia) mtundu. ndi ndi lalanje-wofiira. Ngati pH ndi kuchuluka (pKa = 1.2), proton kuchokera ku gulu la ketone ndi kutayika, zomwe zimapangitsa kuti ion yachikasu, yoyipa yotchulidwa kuti HPS.

Chifukwa chake, phenol red ikuwonetsa chiyani?

Phenol wofiira ndi utoto wosungunuka m'madzi womwe umagwiritsidwa ntchito ngati chizindikiro cha pH, kusintha kuchokera yellow kufiira kupitirira pH 6.6 mpaka 8.0, ndiyeno kutembenukira kowala pinki mtundu pamwamba pH 8.1. Mwakutero, phenol red itha kugwiritsidwa ntchito ngati utoto wa pH pamayeso osiyanasiyana azachipatala ndi ma cell biology.

Kuonjezera apo, zimatanthauza chiyani pamene phenol wofiira amasintha chikasu? Phenol wofiira ndi chizindikiro cha pH chomwe chiri yellow pa pH pansi pa 6.8 ndi wofiira pa pH pamwamba pa 7.4 ndi mithunzi yosiyana kuchokera yellow ku wofiira pakati pa ma pH amenewo. Ngati chizindikiro chatembenuka yellow mu botolo izi zikutanthauza yaipitsidwa ndi chinthu chomwe chapangitsa pH kukhala acidic kwambiri ndikubweretsa pH pansi pa 6.8.

Anafunsidwanso, nchiyani chimayambitsa kusintha kwa mtundu mu phenol wofiira?

The phenol wofiira amasintha mtundu pamene mukuwombamo, chifukwa mukuyambitsa carbon dioxide kusakaniza. Phenol red kusintha kukhala wachikasu mu pH yotsika kuposa 7, kotero yankho limakhala lachikasu ndi chisonyezo cha yankho la acidic (lotsika kuposa 7 pH).

N'chifukwa chiyani yankho linasanduka lofiira?

mpweya woipa umakhudzidwa ndi madzi kupanga carbonic acid. Monga carbonic acid imasiyanitsidwa, ndi yankho limakhala zambiri zachikasu, kusonyeza pH yochepa. Pamene kuwala kulipo ndi chomera anawonjezera, ndi yankho imabwerera ku chiyambi chake wofiira mtundu.

Yotchuka ndi mutu