Conclusion of the the theory involved in determination of strength of given unknown potassium dichromate solution by titrating it against intermediate ferrous ammonium sulphate solution using internal indicator along with reaction
Answers
Answer:
Oxidation-Reduction (Redox) Reactions:
❖ Reaction involving change of oxidation number or transfer of electrons among the reacting substances.
❖ The standard solutions are either oxidising or reducing agents.
❖ The principal oxidising agents are KMnO4
, K2Cr2O7
, Ce(SO4
)2
, I2
, KIO3
, and KBrO3
.
❖ Frequently used reducing agents are Fe(II) and Sn(II) compounds, Na2
S2O3
, As2O3
, Hg2
(NO3
)2
, VCl2 or
VSO4
, CrCl2 or CrSO4
& TiCl3
or Ti2
(SO4
)3
.
2MnO4
-
+ 5H2C2O4
+ 6H+
2Mn2+ + 10CO2
+ 8H2
(Pink) (Colourless)
2MnO4
-
+ 10Fe2+ + 16H+
2Mn2+ + 10Fe3+ + 8H
(Pink) (Colourless)
Cr2O7
2- + 6Fe2+ + 14H+
2Cr3+ + 6Fe3+ + 7H2O
(Orange) (Green)
CuSO4
+ 4KI Cu2
I2
+ K2
SO4
+
(Blue) (White ppt)
2Na2
S2O3
+ I2
Na2
S4O6
+ 2NaI
(Sod. Thiosulphate) (Sod. Tetrathionate)
Explanation:
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