This document provides a method for testing the iron content of ferrous sulfate heptahydrate. The method involves weighing 1g of the sample and dissolving it in water with sulfuric acid and phosphoric acid. The solution is then titrated with potassium permanganate until it turns pink for 30 seconds. The iron content is calculated based on the volume of potassium permanganate used and its concentration. The difference between two test results should be no more than 0.4% for the results to be valid.

1. Rech Chemical Co. Ltd
Certificated by ISO 9001:2008 & FAMI-QS
Contact Person:Thunder Tang (Export Manager)
Tel:86- 731-85864603 Fax:86-731-85864605
Add: No.459 Furong Road,Changsha,Hunan 410007 China
Website:www.rqsulfates.com Email: info@rqsulfates.com
MSN:Thunder.Tang@hotmail.com
TEST METHOD OF FERROUS SULFATE HEPTAHYDRATE
Weigh out 1g of ferrous sulphate heptahydrate and dissolve into 300ml conical
flask, with 50 ml distilled water. Add 10ml of sulfuric acid and 4ml phosphoric acid.
Use potassium permanganate to titration, till the solution become pink with the
color 30 seconds does not disappear.
Calculation:
Use the mass percent to express the content of Fe SO4.7HO (X1).
FeSO4.7H2O( X1) = V·c*0.2780 ×100= 27.80cV
M M
V= The volume of potassium permanganate solution consumed in the test. (mL)
c= The concentration of potassium permanganate. (mol/L)
0.2780= 1.00ml potassium permanganate{c(1/5KMnO4) =1.000mol/L} (g)
M= The sample of value. (g)
The difference between the two test results should not more than 0.4%. The test
result can take the average of the determination.

2. Rech Chemical Co. Ltd
Certificated by ISO 9001:2008 & FAMI-QS
Contact Person:Thunder Tang (Export Manager)
Tel:86- 731-85864603 Fax:86-731-85864605
Add: No.459 Furong Road,Changsha,Hunan 410007 China
Website:www.rqsulfates.com Email: info@rqsulfates.com
MSN:Thunder.Tang@hotmail.com
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