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

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Introduction

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. ...read more.

Middle

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: Description Initial Reading Final Reading Volume of HCl Rough 0 12.5 12.5 First Titration 12.5 23.2 11.3 Second Titration 23.2 35.2 12.0 Average 7.5 15.3 7.7 TABLE SHOWING RESULTS OF IRON TABLET SOLUTION AND POTASSIUM MANGANATE (VII) TITRATION CALCULATIONS: To calculate the amount of iron dissolved in volumetric flask Iron + sulphuric acid --> iron sulphate + hydrogen gas Fe(s) + H2SO4(aq) --> FeSO4(aq) + H2(g) Concerned with 1 mole of iron sulphate produced from 1 mole sulphuric acid # of moles of H2SO4 = volume/1000 X concentration = 100/1000 ...read more.

Conclusion

The conclusions drawn are not as accurate as expected due to the high difference in percentage of acetylsalicylic acid content found compared to that given. Analyzing Iron Tablets Assessment: (M/M) Mark Scheme Weighing - Zero before weighing [1] Heating - Use of proper attire (apron/goggles) - Heat slowly - readjusting flame to proper height/color (any 2 - 1 mark; all 3 - 2 marks) Measuring Volume - Measuring Cylinder: On a flat Surface read bottom of meniscus [1] - Volumetric flask: fill to the mark [1] Pipette: Rinse with required solution [1] Touch top of pipette to surface liquid [1] Proper use of pipette filler [1] - Burette: rinse with required solution Use funnel to fill burette Nozzle free of air bubbles. (any 3- 1 mark; any 4- all 2 marks) Total = ___________ ?? ?? ?? ?? Anuar Flores CHE 124-1 ...read more.

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