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【单选题】
有一碱液,可能是NaOH、NaHCO3、NaCO3或他们的混合物,取碱液VmL,加入酚酞做指示剂,用Cmol/L的盐酸标准溶液滴定至无色,消耗HCl V1 mL,再加甲基橙做指示剂,用Cmol/L的盐酸标准溶液滴定至橙色,消耗HCl V2 mL,若V2>V1,混合碱由何组成?A.
NaOH Na2CO3
B.
Na2CO3 NaHCO3
C.
Na2CO3
D.
NaHCO3
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