1 L水中溶有Mg(HCO3)2和CaCl2的浓度分别为b mol/L和2b mol/L,请在下列试剂

1 L水中溶有Mg(HCO3)2CaCl2的浓度分别为b mol/L2b mol/L,请在下列试剂中选用最合适的一种试剂把溶液中的Mg2+Ca2+去掉

ANaHCO3        B.Na2CO3             C.NaOH               D.Ca(OH) 2

答案

 C

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