DPS-VRJ
****T***
XILTLAB MANUALSI
CHEMISTRY
VOLUMETRICANALYSIS
CLASS-XI
( AIM:
To prepare 100 ml of
M/10
soBution by titrating it againstMohr' s salt sohutüon. Find the molarity and
the standard
solutionof Mohr's sat. strenght in g/Lof KMnO,
(2) Material Required:
Weight box, watch glass, chemical
Mohr's salt crystals, dihite sulphuricbalance, standard flask, conical flash, burette,
acid, distiled water, KMnO, pipette, funnel,
Theory:
Molarit na.naof molesofsolute_
massof solute
volumofsolutior{L) GMMxvolumaf solutio(m)x1 000
mass of splutex1000
10
392x100
mass of solute= 3.92 g (n 100 mL
of solution)
Potassium permanganate oxidises
ferrous ions in acidic medium in cold and
manganous ions. itselfgets reduced to
Ionicequation:
MnO+8H*+5e Mn +4H,O
Fe Fe +e 5
MnO +5Fe" +8H> Mi +5Fe +4H,O
Molecular equation:
2 KMnO,+ 3H,SO, KSO, +2M1SO, + 3H,O + 5 [0]
2Fe SO, NH) SO, 6 H,0 + HSO,. [0] >
Fe, (sO) ,+ 2(NH,), SO, + 13H,O] 5 x
2KMnO, + 10 Fe SO, (NH), SO,. 6H,0 8H,SO, -> K,SO,+ 2 MnSO, SFe, (SO),
+
+ + 10
(NH), SO, + 68 H,O
Formula Used: SM,V, = IM,V,
where
M,= Molarity ofKMnO, M,= Molarity of Mohr Salt
V Volume of KMnO,
V,= Vohune of Mohr salt
Solution'taken in burette: Potassium
Solution taken in pipette: permanganate
End Mohr salt
point, Colouriess to pink
****T***
XILTLAB MANUALSI
CHEMISTRY
VOLUMETRICANALYSIS
CLASS-XI
( AIM:
To prepare 100 ml of
M/10
soBution by titrating it againstMohr' s salt sohutüon. Find the molarity and
the standard
solutionof Mohr's sat. strenght in g/Lof KMnO,
(2) Material Required:
Weight box, watch glass, chemical
Mohr's salt crystals, dihite sulphuricbalance, standard flask, conical flash, burette,
acid, distiled water, KMnO, pipette, funnel,
Theory:
Molarit na.naof molesofsolute_
massof solute
volumofsolutior{L) GMMxvolumaf solutio(m)x1 000
mass of splutex1000
10
392x100
mass of solute= 3.92 g (n 100 mL
of solution)
Potassium permanganate oxidises
ferrous ions in acidic medium in cold and
manganous ions. itselfgets reduced to
Ionicequation:
MnO+8H*+5e Mn +4H,O
Fe Fe +e 5
MnO +5Fe" +8H> Mi +5Fe +4H,O
Molecular equation:
2 KMnO,+ 3H,SO, KSO, +2M1SO, + 3H,O + 5 [0]
2Fe SO, NH) SO, 6 H,0 + HSO,. [0] >
Fe, (sO) ,+ 2(NH,), SO, + 13H,O] 5 x
2KMnO, + 10 Fe SO, (NH), SO,. 6H,0 8H,SO, -> K,SO,+ 2 MnSO, SFe, (SO),
+
+ + 10
(NH), SO, + 68 H,O
Formula Used: SM,V, = IM,V,
where
M,= Molarity ofKMnO, M,= Molarity of Mohr Salt
V Volume of KMnO,
V,= Vohune of Mohr salt
Solution'taken in burette: Potassium
Solution taken in pipette: permanganate
End Mohr salt
point, Colouriess to pink
