3. Examples of titrations are given. Determine which method is used in each specific case: a) direct titration; b) back titration; c) substitution titration. Give the formula for calculating the results of the analysis.
Substance Reaction Equation Titration
Ba2 Ba2 2IO3- ↔ Ba(IO3)2(t)
Ba(IO3)2(t) 10I- 12H ↔ Ba2 6I2 6H2O
I2 2S2O32- ↔ 2J- S4O62- The released iodine I2 is titrated with a solution of Na2S2O3
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