在下列溶液中,各组离子一定能够大量共存的是 A.使酚酞试液变红

在下列溶液中,各组离子一定能够大量共存的是

A.使酚酞试液变红的溶液: Na+、Cl-、SO42-、Fe3+

B.使紫色石蕊试液变红的溶液:Fe2+、Mg2+、NO3-、Cl-

C.c(H+)=10-12 mol·L-1的溶液:K+、Ba2+、Cl-、Br-

D.碳酸氢钠溶液:K+、SO42-、Cl-、H+

答案

C

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