Homework Help: Chemistry Repost

Posted by Neo on Sunday, February 14, 2010 at 5:23pm.

I mixed 5ml H202 with 5ml KI with 5ml H2SO4 wit Na2So2O3 with 50ml. Now I am trying to figure out all the elementary steps for this reaction. A starch was added in this mixture to measure the reaction time with the thiosulfate and the I2. I was just wonder if anyone could give me all the elementary steps for this reaction?

I came up with this but it is wrong or incomplete.

H2O2+2I^-+2H^+ ---> I2 + 2H20
I2+I^- ----> I3^-
I2+2S2O3^2- ---> 2I^- + S4O6^-2
STARCH + I2 ---- BLUE

Now what steps am I missing exactly?
Any help would be appreciated.

Chemistry Repost - DrBob222, Sunday, February 14, 2010 at 5:48pm
That looks ok to me. Personally, I would not have used the second step, although it is correct as you have it. However, I see it used in most of the modern texts; it may be that if you are being taught to use it that you didn't show it with the I3^- + 2S2O3^-2 ==> 3I^- + S4O6^-2

Answer this Question

Related Questions

Chemistry - I mixed 5ml H202 with 5ml KI with 5ml H2SO4 wit Na2So2O3 with 50ml. ...
chemistry - To what final volume should you dilute 50.5ml of a 4.75 M KI ...
Pure pharmacy math - How many ml of terpin hydrate elixirs containing 33mg/5ml ...
physical scince - suppose that one of your test has a capacity of 23ml. you need...
college chemistry - How do you calculate the pH when the following substances ...
college chemistry - How do you calculate the pH difference when the following ...
chemistry - How do you calculate the pH when the following substances are added ...
chemistry - calculate the volume(ml) of a 0.215M KOH solution that will ...
chemistry - What happens when 4ml of 1M HCL is added to 100ml buffer made using ...
Chemistry - What is the pH of a solution that results from the addition of 5mL ...

For Further Reading

First Name:
School Subject:
Answer: