Phenolphthalein yog dab tsi thiab vim li cas nws thiaj siv?
Phenolphthalein yog dab tsi thiab vim li cas nws thiaj siv?

Video: Phenolphthalein yog dab tsi thiab vim li cas nws thiaj siv?

Video: Phenolphthalein yog dab tsi thiab vim li cas nws thiaj siv?
Video: Tshuaj theem vim li cas thiaj tau nqi ?/ Siv kho mob dab tsi?/paris polyphylla use for? 2024, Kaum ib hlis
Anonim

Phenolphthalein feem ntau yog siv raws li qhov taw qhia hauv acid-base titrations. Rau daim ntawv thov no, nws hloov tsis muaj xim nyob rau hauv acidic daws thiab liab dawb nyob rau hauv cov kev daws teeb meem. Phenolphthalein yog me ntsis soluble hauv dej thiab feem ntau yog yaj hauv cawv rau siv hauv kev sim.

Cov lus nug tseem yog, qhov ntsuas phenolphthalein yog dab tsi?

Phenolphthalein , (C20H14O4), ib qho organic compound ntawm phthalein tsev neeg uas yog dav ua hauj lwm raws li ib tug acid-base qhov taw qhia . Raws li ib qhov taw qhia pH ntawm kev daws teeb meem, phenolphthalein yog xim tsis muaj xim hauv qab pH 8.5 thiab muaj xim liab rau xim liab liab saum pH 9.0.

Vim li cas phenolphthalein tsis muaj xim hauv cov kua qaub? Phenolphthalein yog ib tug qaug zog kua qaub thiab tsis muaj xim nyob rau hauv kev daws txawm tias nws ion yog liab. Yog tias hydrogen ions (H+, raws li pom hauv ib qho kua qaub ) tau ntxiv rau cov tshuaj liab liab, qhov sib npaug yuav hloov, thiab cov tshuaj yuav tsis muaj xim.

Hauv qhov no, vim li cas phenolphthalein muab paj yeeb hauv nruab nrab nruab nrab?

Phenolphthalein (Hin) yog tsis muaj zog acidic nyob rau hauv cov xwm. Thiab nyob rau hauv aqueous tov, nws dissociates rau hauv thiab ions. Cov xim liab Qhov kev daws teeb meem yog vim qhov concentration ntawm ions hauv cov tshuaj. Nyob rau hauv acidic tej yam kev mob, lub concentration ntawm nyob rau hauv cov tshuaj yog tsawg heev thiab concentration ntawm yog siab, li no nws yog xim tsis muaj xim.

Dab tsi yog qhov phom sij ntawm phenolphthalein?

  • Qhov muag: Tej zaum yuav ua rau qhov muag khaus.
  • Daim tawv nqaij: Tej zaum yuav ua rau tawv nqaij khaus.
  • Noj: Ua rau plab hnyuv plab nrog xeev siab, ntuav thiab raws plab. Cia siab tias yuav muaj kev phom sij tsawg.
  • Inhalation: Tej zaum yuav ua rau mob ua pa. Tsis tshua muaj kev phom sij rau kev ua lag luam ib txwm muaj.
  • Ntev: Tej zaum yuav ua rau lub raum raug mob.

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