Analysis of commercial vitamin C tablets

Essay specific features

 

Issue:

Science

 

Written by:

Christopher H

 

Date added:

October 5, 2015

 

Level:

University

 

Grade:

A

 

No of pages / words:

7 / 1888

 

Was viewed:

5325 times

 

Rating of current essay:

 
Essay content:

Brown iodine can be easily reduced by acidified ascorbic acid to form colourless iodide ion: < Equation I The excess iodine is then back titrated by standard sodium thiosulphate solution, by using a burette and starch solution (used as end point indicator) Similarly, iodine can also be decolourized by thiosulphate ion: 2S2O32- + I2 > S4O62- + 2I- < Equation II Any iodine present will react with starch to form a blue-black complex...
displayed 300 characters

Custom written essay

All essays are written from scratch by professional writers according to your instructions and delivered to your email on time. Prices start from $10.99/page

Order custom paper

Full essays database

You get access to all the essays and can view as many of them as you like for as little as $28.95/month

Buy database access

Order custom writing paper now!

  • Your research paper is written
    by certified writers
  • Your requirements and targets are
    always met
  • You are able to control the progress
    of your writing assignment
  • You get a chance to become an
    excellent student!

Get a price guote

 
 

However, when all available iodine has been reacted, the blue-black complex becomes colourless which signals the end-point. Hence, the mass of ascorbic acid reacted by iodine can be calculated. Chemicals vitamin C tablet(s), NaIO3, 1M NaI solution, 0.5M H2SO4, approximately 0.06M Na2S2O3, freshly prepared starch solution Apparatus electronic balance, beaker, volumetric apparatus, pipette, glass rod, white tile, dropper, measuring cylinder Procedure 1...
displayed 300 characters

General issues of this essay:

Related essays:

x
Services