The aqueous triiodide ion is shown as the product of reaction... 2. The aqueous

Question

The aqueous triiodide ion is shown as the product of reaction...

2. The aqueous triiodide i (3 (aq)) is shown as the product of reaction (14): however reaction (24) the consecutive equilibria described in reaction (24) shows that the iodine containing product of reaction (14) could equivalently be taken to be I2(aq) or 15 (aa) a. rite a balanced version of reaction (14) taking the iodine containing product to be I 2(aq). b. Write a balanced version of reaction (14) taking the iodine containing product to be (aq). 15

Explanation / Answer

A.

Remove I- from both sides in the equation given in problem (I3- = I2 + I-)

S2O82- (aq) + 2 I- (aq) = 2 SO42- (aq) + I2 (aq)........... equation (1)

B.

Multilply equation (1) with 2

2 S2O82- (aq) + 4 I- (aq) = 4 SO42- (aq) + 2 I2 (aq).........equation (2)

add I- on both sides to equaion (2) (I5- = 2 I2 + I- )

2 S2O82- (aq) + 5 I- (aq) = 4 SO42- (aq) + I5- (aq)

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