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・ Sodium bromate
・ Sodium bromide
・ Sodium butyrate
・ Sodium carbonate
・ Sodium Carbonate Company
・ Sodium cellulose phosphate
・ Sodium channel
・ Sodium channel blocker
・ Sodium channel opener
・ Sodium chlorate
・ Sodium chloride
・ Sodium chloride (data page)
・ Sodium chlorite
・ Sodium chloroacetate
・ Sodium chloroaluminate
Sodium chromate
・ Sodium citrate
・ Sodium cobaltinitrite
・ Sodium coceth sulfate
・ Sodium cocoate
・ Sodium cyanate
・ Sodium cyanide
・ Sodium cyanoborohydride
・ Sodium cyclamate
・ Sodium cyclopentadienide
・ Sodium decavanadate
・ Sodium dehydroacetate
・ Sodium diacetate
・ Sodium dichloroisocyanurate
・ Sodium dichromate


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Sodium chromate : ウィキペディア英語版
Sodium chromate

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Sodium chromate is the inorganic compound with the formula Na2CrO4. It exists as a yellow hygroscopic solid, which can form tetra-, hexa-, and decahydrates. It is an intermediate in the extraction of chromium from its ores. Sodium chromate, like other hexavalent chromium compounds, is toxic and carcinogenic.〔
==Production and reactivity==
It is obtained on a vast scale by roasting chromium ores in air in the presence of sodium carbonate:
:Cr2O3 + 2 Na2CO3 + 3/2 O2 → 2 Na2CrO4 + 2 CO2
This process converts the chromium into a water-extractable form, leaving behind iron oxides. Subsequent to its formation, the chromate salt is converted to sodium dichromate, the precursor to most chromium compounds and materials.〔 The industrial route to chromium(III) oxide involves reduction of sodium chromate with sulfur.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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