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Grade: 12th pass
give a detail account of reagents and their application in estimation of K2Cr2O7 using Na2S2O3 experiment.
10 months ago

Answers : (1)

Vikas TU
8800 Points
The experiment mainly done to standardize the Na2S2O3 solution by using standard  K2Cr2O7.
Here oxidation and reduction both takes place and with the help of idometry is used it is also known as Iodomeytric reaction.
Following are the reactions in this experiment.
6KI+14HCl+ K2Cr2O7 =2CrCl3+3I2 +7H2O+8KCl
After balancing each anion and cations separetly,
6 I- + 14 H+ + Cr2O7 -2 + 6e- = 2 Cr+3 + 3 I2+ 7 H2O
2Na2S2O3 + I2 = Na2S4O6 + 2NaI
S2O3 2- + e- = S4O6 2- + I- 
 K2Cr2O7 acts as an oxidizing agent as it reduces to Cr3+ and I- is a reducing agent as it oxidizes to I2.
And in the second reaction I2 is an oxidizing agent and vice-versa.
  1. To see the reduction and oxidation together 
  2. iodomteric reaction ustification
  3. Also sets an example for redox reaction.
9 months ago
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