OBJECTIVE: To determine the content of iron in iron tablets by titration.

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LAB: #3

DATE: 25th September, 2007

TITLE: Analyzing Iron Tablets

OBJECTIVE: To determine the content of iron in iron tablets by titration.

 

MATERIALS:                                                                                   

  1. goggles and lab coat                              
  2. 2 125cm3 conical flask                          
  3. 1 250cm3 standard volumetric flask    
  4. 1 50cm3 burette
  5. safety filler and pipette
  6. 1 stand and clamp
  7. filter funnel
  8. Bunsen burner kit

Chemicals

  1. Iron tablets
  2. 1.0moldm-3 sulphuric acid (200cm3)
  3. 0.01moldm-3 Potassium Per Manganate
  4. Distilled water/ wash bottles
  5. soap solution

                         

             

PROCEDURES:    

       

Making a solution of the tablets

  1. 5 iron tablets were weighed accurately, and then dissolved in about 100cm3 of 1.0 moldm-3 sulphuric acid in a conical flask. Some heating was required, but not more than the necessary needed to dissolve the tablets.
  2. The mixture was filtered into a beaker, making sure that no solution was lost, then the conical flask was washed out with water and the washings were poured through the filter.
  3. Finally, distilled water was poured over the residue and these washings we collected as well. The filtrate was then poured into a 250cm3 standard volumetric flask, washing out the beaker and adding washings to the standard flask. The mark was made up using distilled water.
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Titration with Potassium Manganate (VII)

  1. Using a pipette (safety) filler, 25cm3 of the iron (II) solution was pipette from the volumetric flask into a conical flask.
  2. About 25cm3 of 1.0 moldm-3 sulphuric acid was added and titrated with 0.01 moldm-3 Potassium Manganate (VII) solution.

3. The experiment was repeated until two coincident results were obtained.  

       

OBSERVATIONS, RESULTS, DATA:

TABLE SHOWING RESULTS OF IRON TABLET SOLUTION AND POTASSIUM MANGANATE (VII) TITRATION

CALCULATIONS: 

To calculate the amount of iron dissolved in ...

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