Please help! Dilution equation.

Question

You have diluted 2.00mL of 4.70mM iodine solution to a total volume of 8.00mL with acetone, acid, and water. It has taken 4.02 minutes for all of the colors to disappear. What is the rate of this reaction in units of mM/min? Report your answer to 3 decimal places.

Answer 1

What is the final concentration of iodine after dilution?

(2.00 ml)(4.70 mM) = (8.00 ml)(x mM)

x = 1.175 mM

1.175 mM / 4.02 min = 0.292 mM/min = average rate

If you wanted to use the integrated rate equation, you'd have to know the order of the reaction. Since we don't know the precise reaction to which you refer, we can't assume any particular order for the reaction, so I've provided an average rate of the reaction.