Jump to content
Sign in to follow this  

Lab Report Rate of Effusion of a Gas

Recommended Posts

Hello all. I'm planning a Chem Lab for Acids and Bases where I'm measuring the rate of reaction between HCl and Mg by measuring the rate of effusion of hydrogen gas. However, I'm not sure if it is feasible to measure the rate of effusion of a gas with a gas collection tube. I was wondering if this is in fact a good idea, or if I should change my experiment, because we have no other equipment available to measure the volume of gas given off.

Share this post


Link to post
Share on other sites

Hello all. I'm planning a Chem Lab for Acids and Bases where I'm measuring the rate of reaction between HCl and Mg by measuring the rate of effusion of hydrogen gas. However, I'm not sure if it is feasible to measure the rate of effusion of a gas with a gas collection tube. I was wondering if this is in fact a good idea, or if I should change my experiment, because we have no other equipment available to measure the volume of gas given off.

Hi,

That is perfectly fine. There is simply one catch to the experiment. By 'rate of reaction' you should be aiming to find out the initial rate of reaction. Why? Say you waited one minute and read the volume of gas collected then, you would be working out the average rate of reaction for that one minute and that is not what you want. If you didn't get that, lets say you let the reaction go to completion then take the reading, all you readings would be the same simply because they are limited by the limiting reagent, all the experiments would give out the same volume of gas.

So what to do? Limit your gas reading time to something small (e.g. 10 seconds after the start) this can represent the inital rate of reaction closely and you will see a more definite increase in the rate when you increase the concentration of either reactant.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.