(来学网)若使在滴定时,消耗盐酸溶液(0.2mol/L)20~25ml,则应称取基准物质碳酸钠约多少克(碳酸钠的分子量为106g)
  • A.
    (来学网)0.21~0.26g
  • B.
    (来学网)2.1~2.6g
  • C.
    (来学网)0.021~0.026g
  • D.
    (来学网)0.42~0.52g
  • E.
    (来学网)4.2~5.2g