This discussion is now closed.

Check out other Related discussions

OCR B (Salters) F336: Individual Investigation 2013/14

Scroll to see replies

awwww! It's horribly complicated as it's something you have made. I really want to hand this in tomorrow but I feel like I can do loads more on it. There is loads you can write about in the evaluation as a lot can go wrong, good luck. Same! Need an A in this coursework :'( , best of luck and I;m sure yours will be amazing!

Reply 181

7jdrabble

What catalyst has everyone used for the reaction between potassium iodide and potassium peroxodisulfate? Thats all i have left to do so any help will be greatly appreciated!

Reply 182

ronnimoo

Original post by 7jdrabble

What catalyst has everyone used for the reaction between potassium iodide and potassium peroxodisulfate? Thats all i have left to do so any help will be greatly appreciated!

I used FeCl3 but you will probably have to alter you concentrations and volumes because it is SO fast

Reply 183

Mohid Khan

Is no one doing copper ? :cry:

Reply 184

kaitlyn_123

hope everyones investigations is going well :smile:

Just wondered if anyone knows where I can find out;

1. The error associated with a 100ml volumetric pipette
2. The error associated with a 100ml volumetric flask
3. Also, how to work out total uncertainties?

Reply 185

kaitlyn_123

i've made a really stupid mistake, i used the mr of aspirin just as 180 and the mr of salicylic acid as 138.12 ijgwsgoiwgiwrhiwrhijg will this cost me :frown:

Reply 186

izzyb96

Original post by Mohid Khan

Is no one doing copper ? :cry:

i am!

Reply 187

Mohid Khan

Original post by izzyb96

i am!

yes come on :dance:

how did you use your results, calculations ?

need help

Reply 188

pinpin95

does a calibration curve have to pass through zero???

dono, plz find out

Original post by pinpin95

does a calibration curve have to pass through zero???

yes it does, as you probably used distilled water to zero the colorimeter which has a concentration of zero obviously so 0 concentration = 0 absorbance :smile:

Reply 191

izzyb96

Original post by Mohid Khan

yes come on :dance:

how did you use your results, calculations ?

need help

what methods did you use?

Reply 192

Mohid Khan

Original post by izzyb96

what methods did you use?

ion exchange,
colorimetry,
Electrochemical cell

which did you do?

I have to hand it in soon :frown:

Reply 193

izzyb96

Original post by Mohid Khan

ion exchange,
colorimetry,
Electrochemical cell

which did you do?

I have to hand it in soon :frown:

i did colorimetry, titration with EDTA and titration with excess iodide ions :smile:

same! my first draft was due in last week...

Posted from TSR Mobile

Reply 194

Mohid Khan

Original post by izzyb96

i did colorimetry, titration with EDTA and titration with excess iodide ions :smile:

same! my first draft was due in last week...

Posted from TSR Mobile

you didn't do the one with ion exchange resin? :frown:

Reply 195

lizz-ie

Original post by izzyb96

i did colorimetry, titration with EDTA and titration with excess iodide ions :smile:

same! my first draft was due in last week...

Posted from TSR Mobile

My final draft is due tomorrow! D:

Posted from TSR Mobile

Reply 196

Mohid Khan

Original post by lizz-ie

My final draft is due tomorrow! D:

Posted from TSR Mobile

which topic are you doing?

Reply 197

lizz-ie

Original post by Mohid Khan

which topic are you doing?

The iodine clock with peroxodisulfate :smile:

Posted from TSR Mobile

Reply 198

Mohid Khan

Original post by lizz-ie

The iodine clock with peroxodisulfate :smile:

Posted from TSR Mobile

Good luck, i have no clue what thats about. :tongue:

which county is your school in? most schools ask for the cw either in the end of dec or in may :confused:

Reply 199

Davelittle

Anyone doings rates?

Specifically iodine and propanone?

If so what kind of stuff have you said in your evaluation? Everything else of mine is ok I just can't seem to get started with this evaluation -.-