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离子共存

> 下列各组离子一定能大量共存的是（　　） A．加入KSCN溶液显血红色的溶液中：Fe2+、Mg2+、Cl-、SO42- B．能与金属铝反应放出氢气的溶液中：K+、NO3-、Cl-、Fe2+ C．常温下水电离出的c（H+）•c（OH-）=10-20 （mol•L-1）2的溶液中：Na+、ClO-、S2-、NH4+ D．pH=7的溶液：Fe3+、Mg2+、SO42-、Cl-

问题：

发布时间：2024-09-10

下列各组离子一定能大量共存的是（　　）

A．加入KSCN溶液显血红色的溶液中：Fe²⁺、Mg²⁺、Cl^-、SO₄^2-

B．能与金属铝反应放出氢气的溶液中：K⁺、NO₃^-、Cl^-、Fe²⁺

C．常温下水电离出的c（H⁺）•c（OH^-）=10^-20 （mol•L^-1）²的溶液中：Na⁺、ClO^-、S^2-、NH₄⁺

D．pH=7的溶液：Fe³⁺、Mg²⁺、SO₄^2-、Cl^-

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