Find out the concentration of given potassium permanganate solution in gram per litre. For this purpose you are provided a standard solution of crystalline ferrous ammonium sulphate of M/30 molarity .

Theory-It is a redox reaction where ferrous ammonium sulphate also acts as reducing agent just-like oxalic acid.

Chemical reacting takes place

oxn reaction

FeSO₄(NH₄)2SO₄.6H₂O + H₂SO₄ +[O] ——-> Fe₂(SO₄)₃ + (NH₄)₂ SO₄ + 7H₂O

Redn reaction

KMnO₄+3H₂SO₄ ———-> K₂(SO₄) + MnSO₄ + 3H₂O +5[O]

Apparatus and Materials required –

Burette, pipette, conical flask, funnel, burette stand, washing bottle, Ferrous ammonium sulphate solution, (Known & unknown), KMnO4 solution, distilled water, dil H₂SO₄ .

Observation Table

Titration Table

Titration between KMnO₄ solution with Ferrous ammonium sulphate solution.

S.No.	Volume of FAS Solution (V₁) (mL)	Burette Reading (mL)		Volume of KMnO₄ Solution (b – a) (mL)	Concordant Reading (V₂) (mL)
		Initial (a)	Final (b)
1	20	0.0	18.3	18.3
2	20	0.0	18.1	18.1	18.1
3	20	0.0	18.1	18.1

Calculation –

a) Molarity of intermediate KMnO4 solution

M₁V₁ = 5M₂V₂

where,

M₁ = Molarity of known Ferrous ammonium sulphate solution.= M/30

M₂ = Molarity of intermediate KMnO₄ solution.= ?

V₁ = Volume of known FAS solution.= 20 ml

V₂ = Volume of intermediate KMnO₄ solution.= 18.1 ml

M₁V₁ = 5M₂V₂

$\displaystyle {{M}_{2}}=\frac{{{{M}_{1}}{{V}_{1}}}}{{5{{V}_{2}}}}$

$\displaystyle {{M}_{2}}=\frac{{1\times 20}}{{30\times 5\times 18.2}}$

Concentration = Molarity × Molecular Mass

= $\displaystyle {{M}_{2}}=\frac{{20}}{{30\times 5\times 18.2}}\times 158$

=1.1575 gm/Lit

Result : The concentration of given potassium permanganate solution in gram per litre is 1.1575 gm/Lit

Titration KMnO4 V/s ferrous ammonium sulphate

Titration between KMnO4 solution with Ferrous ammonium sulphate solution.