You are Here: Home

# Order of reaction

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. Describe the method of measuring the order of reaction with respect to HCl in the reaction between
Na2S2O3 + HCl
2. You just need to do a study of the rate of reaction with different ratios of thiosulfate and HCl. For example:

Do 1mmol of thiosulfate to 1mmol of HCl
Then, 1mmol of thiosulfate to 2mmol of HCl
then, 1mmol of thiosulfate to 4mmol of HCl..

So on, so forth.

If the rate doubles when you double the concentration of HCl, then the reaction is first order with respect to HCl
If the rate quadruples when you double the concentration of HCl, then the reaction is 2nd order with respect to HCl
3. This is similar to what I wrote, my tutor says I have to keep the volume of the beaker the same, but I'm not sure how.
4. Well you'd generally make it up to a volume with another solvent, such as water. So in reality what you'd is like

1mL of 1m Thiosulfate solution, 1mL of 1M HCl and 8mL of water

Then for the others you'd just add extra HCL and make the rest up with water, keeping the volume constant, i.e the ratios:

18
17
15
5. Of course. Thanks

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: May 16, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

### Who would you like to thank?

Poll
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.