现取仅含nacl杂质的纯碱样品23.4克,全部溶于350克水中再加Bacl2溶液166克,恰好完全反应,过滤沉淀

1个回答

  • 1、 Na2CO3 + BaCl2 = 2NaCl + BaCO3

    106 2*58.5 197

    x y 39.4

    x = 106*39.4/197 = 21.2

    y = 39.4*117/197 = 23.4

    2、滤液中NaCl的质量 = y + (23.4 - 21.2) = 25.6

    滤液质量 = 23.4 + 350 + 166 - 39.4 = 500

    NaCl的质量分数 = 25.6/500 = 5.12%