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称取混合碱(碳酸盐) 2.4000g ,溶解稀释至 250mL ,取两份 25.00mL 溶液,一份以酚酞为指示剂,耗去 0.1000mol/L HCl 30.00mL ,另一份以甲基橙为指示剂,耗去 HCl 35.00mL ,则下列说法正确的是( ) Mr ( Na 2 CO 3 ) =105.99 ; Mr ( NaHCO 3 ) =84.01 : Mr ( NaOH ) =40.01 )
A.
该混合碱由 Na 2 CO 3 和 NaHCO 3 组成
B.
该混合碱由 Na 2 CO 3 和 NaOH 组成
C.
Na 2 CO 3 含量32.53% NaHCO 3 含量37.23%
D.
Na 2 CO 3 含量 22.08% NaOH 含量 41.68%
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