硝酸亚铁溶液中存在的主要平衡关系是：Fe22H2OFe(OH

硝酸亚铁溶液中存在的主要平衡关系是：Fe²⁺+2H₂OFe(OH)₂+2H⁺。若向硝酸亚铁溶液中加入盐酸，观察到的现象是（）

A．溶液颜色变黄	B．溶液颜色变浅
C．溶液颜色变绿	D．无明显变化

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