下列说法中,正确的是 A.将铁片放入硫酸铜溶液中反应一会儿取出,

下列说法中,正确的是

A.将铁片放入硫酸铜溶液中反应一会儿取出,溶液的质量增加

B.氢氧化钠的俗名:火碱、烧碱、纯碱

C.测定某溶液的pH时,要先用蒸馏水将pH试纸润湿

D.可选用紫色石蕊溶液或铁粉为试剂,鉴别氢氧化钠溶液和稀盐酸

答案

D

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