Answer to Question #301459 in Physical Chemistry for heyin

Question

Predict and explain the effect of the given factors on the rate of the following reaction.

K₂S₂O₈ (aq)  + 2KI (aq)                 I₂ (aq)  +  2K₂SO₄ (aq)

 

a.   Adding more K₂S₂O₈

b.   Holding the reaction in a 4^◦ C water bath

Answer 1

Sodium thiosulfate is used to reduce iodine back to iodide before the iodine can complex with the starch to form the characteristic blue-black color.