Potassium chromate. Ukulungiswa kwezakhiwo imichiza ngokwasemzimbeni. isicelo

potassium chromate okanye potassium hromovoloknisty (igama ngamazwe: Kalium chromicum, Kaliumchromat, Potassium chromate) - yikhompawundi ezingaphiliyo, ziikristale emthubi nkqubo orthorhombic, enyibilikayo emanzini. Libhekisela neetyuwa ze chromic acid H2CrO4, nto leyo urhulumente free ayikho ntoni. Ngoqobo potassium chromate ilandelayo ifomula: CrK2O4

Indlela ukufumana potassium chromate?

potassium Hromovoloknisty sifumaneka ngeendlela ezininzi:

1. Xa chromium oxide igcwala potassium khloreyithi (indlela kuthatha indawo kubushushu degrees 500-700):

Cr2O3 (chromium oxide) + KClO3 (potassium khloreyithi) + K2CO3 (potassium carbonate) = 2K2CrO4 (potassium chromate) + KCl (potassium chloride) + 2CO2 (gas గుర్తులు ibhaloni)

2. Xa ukuchitha oxide chromium kwi potassium hayidroksayidi :

CrO3 (chromium oxide) + 2KOH (potassium hayidroksayidi) = K2CrO4 (potassium chromate) + H2O (amanzi)

3. Xa yokubola potassium dichromate ngokutshisa (abasabela lwenziwa kubushushu degrees 500-600):

4K2Cr2O7 (potassium dichromate) = 4K2CrO4 (potassium chromate) + 2Cr2O3 (chromium oxide) + 3O2 (oksijini)

4. Xa ukwenekwa isisombululo oludibeneyo potassium hayidroksayidi ukuya potassium dichromate :

K2Cr2O7 (potassium dichromate) + 2KOH (potassium hayidroksayidi) = 2K2CrO4 (potassium chromate) + H2O (amanzi)

5. uhlobo izimbiwa ezinqabileyo ekuthiwa "tarapakait". It hromovoloknisty potassium ingxubevange.

Potassium Iipropati chromate chemical:

1. Ngo-asidi yaze yangxenga ifuthe lomanyano hromovoloknisty potassium ongena potassium dichromate, ogama ifomula K2Cr2O7. Umzekelo zisabela kulandelayo:

2K2CrO4 (potassium chromate) + 2HCl (zehydrochloric acid exutywe) = K2Cr2O7 (potassium dichromate) + 2KCl (potassium chloride) + H2O (amanzi)

2. Ngokubambisana asidi bomeleleyo basabela ngendlela eyahlukileyo kuthatha indawo, umzekelo:

K2CrO4 (potassium chromate) + 2HCl (zehydrochloric acid ifomu kanzulu) K = (Kr (Cl) O3) (complexed chromium) + KCl (potassium chloride) + H2O (amanzi)

3. Xa indlela ne potassium chromate asidi bagxila umboniso oxidizing iipropati ezishushu. Umzekelo na indlela ilandelayo wenziwe lobushushu degrees 90:

2K2CrO4 (potassium chromate) + 16HCl (zehydrochloric acid) = 2CrCl3 (chromium chloride) + 3Cl2 (njengoko igesi yeKhlorini) + 4KCl (potassium chloride) + 8H2O (amanzi)

4. Hromovoloknisty potassium unokungena ngayo exchange. Umzekelo:

K2CrO4 (potassium chromate) + 2AgNO3 (nitrate yesilivere) = Ag2CrO4 (chromate yesilivere, ngokwemvula) + 2KNO3 (potassium nitrate)
K2CrO4 (potassium chromate) + Hg2 (NO3) 2 (mercury nitrate) = Hg2CrO4 (mercury chromate ngokwemvula) + 2KNO3 (potassium nitrate)

Iimpawu ezibonakalayo potassium chromate:

1. Le konga 2,732 g / cm3.
2. Ipotaziyam chromate linyibilike kwi 968,3 ° C. Kubushushu degrees 668 engena kwisiGaba ezinamacala red - ofumana omnye umbala - obomvu. Noko ke, phezu lungapholi kwakhona yaba ebengezelayo.
3. Amaxwebhu ziikristale yellow inkqubo rhombic.
4. fanele kwiqela isithuba P-nam.
5. Kubhekisele paramagnetic.
6. awonayo ihlwempu ethanol, ezingenakunyibilika emanzini. Enyibilikayo ethyl utywala kunye diethyl.
7. Ubunzima izinyo yi 194,19 g / Mol.

Iipropati Optical potassium chromate:

I zokunganyangeki index ye 1,74

Apho kuyimfuneko potassium chromate?

1. Ishishini yesikhumba isetyenziswa njenge arhente kwezikhumba. Xa bokudaya amalaphu isetyenziswe njengendawo mordant.
2. Oku kusetyenziswa njengenxalenye ye electrolyte nokwakhiwa ikhemikali bamafutha okhethekileyo.
3. Njengoko brightener for wax neoli.
4. Xa ezwi kwiziphili i oxidant, umzekelo, ekuvelisweni nedayi.
5. isisombululo potassium Kwakhona hromovoloknisty esetyenziselwa ukulungiselela igcwala electrochemical zesilivere, ibe indlela iimveliso ezivela nobhedu nesilivere aluminium.
6. isetyenziswa njengeyeza ngamayeza amayeza.
7. Xa iilebhu izitya ngumxube imithamo ngokulinganayo sulphuric acid kanzulu K2Cr2O7 isisombululo, ngaphambili befumile kule ngqele.

Ipotaziyam dichromate (igama zobugcisa - Chrompick)

It imele ziikristale abomvu-orange umbala. Akukho zifom crystalline, onokuxinana 2,684 gram nganye sentimitha cc, linyibilike ngama 397. On ukufudumeza ngakumbi abole. Ukunyibilika emanzini ashushu 20 ilingana 12,48 grams yetyuwa 100 grams yamanzi nganye. Ipotaziyam dichromate lisetyenziswa njengendlela oxidant kwi umdlalo, ishishini mdlalo, kwaye reagent kwi hromametrii.