C,02 Different ions of Cr in aqueous solution color pH for their existence 3 Cr,03 橙红 <2 50 CrO CrO2 黄 >6 Cr3+(aq) 紫 酸性 Cr(OH) 亮绿 强碱 Cr2+(aq)Cr3+(aq) Cr2+(aq) 蓝 酸性color pH for their existence 橙红 ＜2 黄 ＞6 Cr3+(aq) 紫 酸性 亮绿 强碱 Cr2+(aq) 蓝 酸性 Different ions of Cr in aqueous solution 2- Cr2 O7 2- CrO4 - Cr(OH)4 Cr2+(aq) Cr3+(aq) 2- Cr2 O7 2- CrO4