Potassium chromate. Shiri na sinadaran da jiki Properties. aikace-aikace

potassium chromate ko potassium hromovoloknisty (kasa da kasa sunan: Kalium chromicum, Kaliumchromat, Potassium chromate) - shi ne wani inorganic fili, yellow lu'ulu'u na orthorhombic tsarin, mai narkewa a cikin ruwa. Yana nufin salts na chromic acid H2CrO4, wanda a cikin free jihar ba ya wanzu. A abu potassium chromate wadannan dabara: CrK2O4

Yadda za a samu potassium chromate?

Hromovoloknisty potassium samu a hanyoyi da dama:

1. By chromium oxide hadawan abu da iskar shaka potassium chlorate (dauki faruwa a zazzabi na 500-700 digiri):

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

2. By dissolving da chromium oxide a potassium hydroxide :

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

3. By bazuwar na potassium dichromate ta dumama (dauki ne da za'ayi a zazzabi na 500-600 digiri):

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

4. Ta daukan hotuna zuwa wani dabzar bayani na potassium hydroxide zuwa potassium dichromate :

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

5. A yanayin da rare ma'adinai da ake kira "tarapakait". Yana hromovoloknisty potassium gami.

Potassium chromate sinadaran Properties:

1. A tsarma acid hromovoloknisty potassium shiga potassium dichromate, wanda dabara K2Cr2O7. An misali ne da wadannan dauki:

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

2. A tare da tare da karfi acid da daban-daban dauki faruwa, misali:

K2CrO4 (potassium chromate) + 2HCl (hydrochloric acid a dabzar form) K = (Kr (CL) O3) (complexed chromium) + KCl (potassium chloride) + H2O (ruwa)

3. A dauki tare da potassium chromate zafi mai karfi acid nuna oxidizing Properties. An misali ne da wadannan dauki ne da za'ayi a zazzabi na 90 digiri:

2K2CrO4 (potassium chromate) + 16HCl (hydrochloric acid) = 2CrCl3 (chromium chloride) + 3Cl2 (as chlorine gas) + 4KCl (potassium chloride) + 8H2O (ruwa)

4. Hromovoloknisty potassium iya shiga cikin musayar halayen. Ga misali:

K2CrO4 (potassium chromate) + 2AgNO3 (azurfa nitrate) = Ag2CrO4 (azurfa chromate, precipitates) + 2KNO3 (potassium nitrate)
K2CrO4 (potassium chromate) + Hg2 (NO3) 2 (Mercury nitrate) = Hg2CrO4 (Mercury chromate precipitates) + 2KNO3 (potassium nitrate)

The jiki Properties na potassium chromate:

1. The yawa ne 2,732 g / cm3.
2. Potassium chromate narke a 968,3 ° C. A zazzabi na 668 digiri shiga cikin ja kyakkyawan lokaci - yakan mallaki wani launi - ja. Duk da haka, a kan sanyaya zama rawaya sake.
3. Forms rawaya lu'ulu'u rhombic tsarin.
4. A nasa ne da sarari kungiyar P-Nam.
5. nufin da paramagnetic.
6. Poor narkewa a cikin ethanol, insoluble a ruwa. Narkewa a ethyl barasa da diethyl.
7. The matauni taro ne 194,19 g / mol.

Tantancewar Properties na potassium chromate:

A Refractive index of 1,74

Inda m potassium chromate?

1. A fata masana'antu da ake amfani da matsayin tanning wakili. A rini daga yadudduka amfani da wani mordant.
2. Ana amfani da matsayin wani bangare ne na electrolyte abun da ke ciki na musamman sinadaran degreasing.
3. Kamar yadda brightener for kakin zuma da kuma man fetur.
4. A Organic kira a matsayin oxidant, misali, a samar da dyes.
5. Har ila yau hromovoloknisty potassium bayani amfani ga shiri na electrochemical hadawan abu da iskar shaka na azurfa, kuma ga nassi na kayayyakin daga tagulla da kuma azurfa gami.
6. amfani da wani homeopathic magani a magani.
7. A cikin dakunan gwaje-gwaje dishwashing ne cakuda daidai kundin na mayar da hankali sulfuric acid da kuma K2Cr2O7 bayani, a baya cikakken a cikin sanyi.

Potassium dichromate (da fasaha sunan - Chrompick)

Yana wakiltar lu'ulu'u na ja-orange launi. Babu crystalline siffofin, yana mai yawa na 2,684 gram da cubic santimita, narke a zazzabi na 397 digiri. A kara dumama decomposes. Solubility a ruwa a 20 digiri ne daidai 12.48 grams na gishiri da 100 grams na ruwa. Potassium dichromate ne yadu amfani matsayin oxidant a pyrotechnics, wasan masana'antu, da kuma matsayin reagent a hromametrii.