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DETERMINATION of FeSO4

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(1)

DETERMINATION of FeSO

4

Fe

2+

is oxidized to Fe

3+

in acidic medium by MnO

4-

MnO

4-

+ 5Fe

2+

+ 8H

+

→ Mn

2+

+ 5Fe

3+

+ 4H

2

O

• Dilute the 20 mL FeSO

4

sample in the volumetric flask to 100 mL with distilled water and mix it well.

• Transfer a portion of 25 mL diluted sample to an erlenmeyer flask and add 10 mL ½ diluted H

2

SO

4

.

• Add 50-100 mL distilled water and titrate with standardized KMnO

4

solution until pink color.

REFERENCES

Analitik Kimya Pratikleri – Kantitatif Analiz (Ed. Feyyaz ONUR)

(2)

CALCULATIONS

Calculate the concentration of the iron (II) sulfate of the sample in g/L (MWFeSO4 = 152 g/mol)

Firstly, calculate the mol of reacted KMnO4 using the molarity of KMnO4 and the volume of KMnO4 used in the titration:

According to the reaction:

1 mol KMnO4 reacts with 5 mol FeSO4

mol KMnO4 reacts with x mol FeSO4

Calculate the mol of diluted FeSO4 () is using above proportion. Using x, calculate the molarity of diluted FeSO4:

Calculate the molarity of sample by multiplying the molarity of diluted sample with dilution factor:

Msample = M FeSO4 x DF

Finally, convert the molarity of sample to concentration in g/L:

C(g/L) = Mnumune x 152

•

Referanslar

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