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15问答网 > 只用一种试剂就能鉴别出NaCl、BaCl2、Na2CO3三种溶液，应选用（　　）A．H2SO4B．HClC．Ca（OH）2D．AgNO

只用一种试剂就能鉴别出NaCl、BaCl2、Na2CO3三种溶液，应选用（　　）A．H2SO4B．HClC．Ca（OH）2D．AgNO

2025-03-16 01:58:11

推荐回答（1个）

回答1：

A．NaCl、BaCl₂、Na₂CO₃分别与硫酸混合的现象为：无现象、白色沉淀、无色气体，现象不同，可鉴别，故A选；
B．NaCl、BaCl₂均不与HCl反应，现象相同，不能鉴别，故B不选；
C．NaCl、BaCl₂均不与Ca（OH）₂反应，现象相同，不能鉴别，故C不选；
D．NaCl、BaCl₂、Na₂CO₃三种溶液均与AgNO₃反应生成白色沉淀，现象相同，不能鉴别，故D不选；
故选A．

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