Potassium chromate. Ukulungiselela izakhiwo wamakhemikhali nezibulala ngokomzimba. isicelo

potassium chromate noma potassium hromovoloknisty (igama international: Kalium chromicum, Kaliumchromat, potassium chromate) - kuyinto kwakwakhe wezinto ezingaphili, ama zinhlayiya ophuzi kohlelo orthorhombic, oncibilikayo emanzini. Libhekisela nosawoti of chromic acid H2CrO4, okuyinto esimweni khulula alikho. Ngoqobo potassium chromate elandelayo ifomula: CrK2O4

Uyithola kanjani i-potassium chromate?

potassium Hromovoloknisty etholwe ngezindlela eziningana:

1. ngu chromium oxide namachibi potassium chlorate (ukusabela senzeka ezingeni lokushisa 500-700 degrees):

Cr2O3 (chromium oxide) + KClO3 (potassium chlorate) + K2CO3 (ye-potassium carbonate) = 2K2CrO4 (potassium chromate) + KCl (potassium chloride) + 2CO2 (carbonic acid igesi)

2. ngu Ukuqedwa oxide chromium e potassium hydroxide :

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

3. ngu noqhekeko potassium dichromate ngu Ukushisa (ukuphendula Kwenziwa ezingeni lokushisa 500-600 degrees):

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

4. ngu ukuchayeka isixazululo kanzulu potassium hydroxide ukuze potassium dichromate :

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

5. Uhlobo amaminerali ezingavamile ukuthi ibizwa ngokuthi "tarapakait". It hromovoloknisty potassium ingxubevange.

Potassium chromate chemical izakhiwo:

1. acid alulaze hromovoloknisty potassium ingena potassium dichromate, ogama ifomula K2Cr2O7. Isibonelo ukusabela elandelayo:

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

2. ngokuhlanganyela acid esinamandla basabele ngokuhlukile senzeka, isibonelo:

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

3. Ngo-ukusabela potassium chromate ashisayo acid bagxila umbukiso oxidizing izakhiwo. Isibonelo eyasabela ngayo Kwenziwa ngaso lokushisa 90:

2K2CrO4 (potassium chromate) + 16HCl (hydrochloric acid) = 2CrCl3 (chromium chloride) + 3Cl2 (njengoba chlorine igesi) + 4KCl (potassium chloride) + 8H2O (amanzi)

4. Hromovoloknisty potassium ungangena exchange ukusabela. Ngokwesibonelo:

K2CrO4 (potassium chromate) + 2AgNO3 (esiliva nitrate) = Ag2CrO4 (esiliva chromate, ehlele) + 2KNO3 (potassium nitrate)
K2CrO4 (potassium chromate) + Hg2 (NO3) 2 (mercury nitrate) = Hg2CrO4 (mercury chromate kusheshisa) + 2KNO3 (potassium nitrate)

Izakhiwo potassium chromate:

1. konga 2,732 g / cm3.
2. potassium chromate liyancibilika at 968,3 ° C. At lokushisa 668 degrees engena obomvu isigaba olunezinhlangothi - ozuza komunye umbala - ebomvu. Nokho, phezu Ukupholisa baba aphuzi futhi.
3. Amafomu ophuzi zinhlayiya uhlelo rhombic.
4. It kungokwalabo isikhala iqembu P-nam.
5. Kushiwo paramagnetic.
6. encibilikayo Abampofu Ethanol, zingaxazululeki emanzini. Oncibilikayo ETHYL utshwala kanye diethyl.
7. I mass izinyo lomhlathi kuyinto 194,19 g / Mol.

izakhiwo Optical potassium chromate:

Inkomba yezokubona ka 1.74

Lapho kuphumeleleka khona potassium chromate?

1. umkhakha lesikhumba isetshenziswa njenge-agent ukushuka. Ngo nokudaya izindwangu lisetshenziswa njengedivaysi mordant.
2. Lisetshenziswa njengendlela ingxenye ukwakheka electrolyte lwekhemikhali degreasing ekhethekile.
3. Njengoba brightener ngoba wax namafutha.
4. zamagama organic njengenhlangano oxidant, isibonelo, emsebenzini wokukhiqiza nodayi.
5. isixazululo potassium Futhi hromovoloknisty esetshenziselwa ukulungiswa namachibi electrochemical esiliva, ngoba ukudlula imikhiqizo ephuma ithusi nesiliva Alloys.
6. esetshenziswa njengoba ikhambi homeopathic kwezokwelapha.
7. Ngo-laboratories yokugeza izitsha inhlanganisela amavolumu alinganayo kanzulu sulfuric acid futhi isixazululo K2Cr2O7, ngaphambili ayegcwele emakhazeni.

Potassium dichromate (igama lobuchwepheshe - Chrompick)

Limelela zinhlayiya umbala obomvu-olintshi. Awekho amafomu crystalline, has a kwabantu 2,684 igremu ngayinye isentimitha cubic, liyancibilika at 397 degrees. On Ukushisa okwengeziwe ubola. Solubility emanzini at degrees 20 ilingana 12,48 amagremu kasawoti ngalinye amagremu 100 amanzi. Potassium dichromate kabanzi njengenhlangano oxidant ku pyrotechnics, imboni umdlalo, futhi njengoba reagent e hromametrii.