---You may find the key to the maths problem on page 107 . ---Ah, it’s so simple . I wonder why I of that . A. hadn’t thought B. haven’t thought C. didn’t think D. wasn’t thinking 答案:C某同学欲用下图实验装置和药品以测定Wg由和FeO组成的混合物中的质量.已知草酸能发生如下反应:
实验中还可选用的试剂有:3mol/L NaOH 浓1mol/L溶液
(1)实验开始时,盛放草酸(s)的烧瓶,应先加浓还是先加热?__________________.理由是_________________________________.
(2)写出D装置中发生反应的化学方程式:_________________________.
(3)写出B装置中发生反应的离子方程式:_________________________.
C装置的作用是_______________________________________________.