Jump to content
Sign in to follow this  
teddybear_01

Please Help Mee Asap!!!!

Recommended Posts

hello

to investigate the percentage of purity of iron i iron tablets what else would i have to do apart from titration and colorimtery?

 

Also, how could i investigate effectiveness of sunscreen aginast UV?

 

Lastly, how could i briefly investigate the conc of caffeine in diff coffee brands?

 

I am desparate for help and would rly appreciate it asap!

 

Thanks

Share this post


Link to post
Share on other sites

The first two I'd do using optical effects...

 

The first by doing some magnetrometry... And some clever maths, and the second by just doing a transmission spectrum through the sample using a lightsource + detector that can do UV.

 

But neither method are chemical methods so....

Share this post


Link to post
Share on other sites

I'd not bother with magnetometry. I'd dissolve the tablets in dilute acid, oxidise with H2O2 to get it all into Fe(III) then measure it colourimetrically. If I wanted to be classical about it I'd not oxidise the extract, I'd send it through a Jones reductor and then titrate the eluant with KMnO4

I have a feeling that you would need to do some sort of purification of the coffee extract before you could do a UV determination on the caffeine. I'd bet on chromatography.

Not sure about the sunscreen- some sort of absorbtivity measurement.

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  

×
×
  • Create New...

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.