tangtang
第31楼2013/07/25
附件里的数据没有给出重铬酸钾滴定液的浓度。附件的方法中,有以下的信息,是否就是计算依据?
0.1N Potassium Dichromate solution - Dissolve 4.39g of K2Cr2O7 with water in 1L volumetric flask and bulk to 1L mark with water.
以及:
Weigh in triplicate 0.9 to 1.0g portions of Fe(NH4)2(SO4)2.6H2O into 250ml beaker. Dissolve in 10ml water and 5ml HCl. Add 5ml HNO3 and 5ml of 50% v/v H2SO4, and then continue through as in the procedure. Calculate the titre of potassium dichromate standard solution.
Wt. of Fe(NH4)2(SO4)2.6H2O x 0.1424
Titre = -----------------------------------------------------
mls of K2Cr2O7
The percent Fe is calculated by using the titre that applies at the range of the titration of the assay.
Titration in mls x Titre x 1.28648
% FeO = -------------------------------------------------------- x 100
Wt. of sample in g
abcpgf
第34楼2013/07/25
如果你觉得需要,可以自己算呀,没必要写得那么详细吧。