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Titration of ammonium iron(II) sulphate and potassium managanate

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Introduction

Data Collection Table 1: Uncertainty of equipment No Apparatus Uncertainty 1 50.00 cm3 � 0.05 cm3 2 25.00 cm3 � 0.03 cm3 3 Electronic balance � 0.1 g 4 250.0 cm3 volumetric flask � 0.3 cm3 Table 2: Mass of ammonium iron(II) sulphate Mass of container + ammonium iron(II) Sulphate / �0.1 g 15.1 Mass of container + residual ammonium Iron(II) ...read more.

Middle

Volume of ammonium iron(II) sulphate used in pipette= 25.00 cm3 � 0.03 cm3 Volume of ammonium iron(II) sulphate prepared in volumetric flask= 250 cm3 � 0.3 cm3 Data processing Average volume of potassium managanate(VII) used = =12.40cm3� 0.10 cm3 Redox equation for the reaction. 5Fe2+ +MnO4-+8H+� 5Fe3+ + Mn2+ + 4H2O No. Of moles of ammonium iron(II) ...read more.

Conclusion

in mol dm-3 5.9x10-4 mol/ 12.40cm3x10-3= 4.76 x10-2mol dm-3 Total uncertainty of apparatus Apparatus Error Quantity measured % uncertainty Burette � 0.10 cm3 12.40cm3 0.10/12.40x100% = 0.81% Pipette � 0.03 cm3 25.00 cm3 0.03/25.00x100% = 0.12% Volumetric flask � 0.3 cm3 250.0 cm3 0.3/250.0x100% =0.12% Electronic balance � 0.1 g 9.8g 0.1/9.8x 100% =1.02 Total % uncertainty 2.07% Uncertainty of conc of potassium manganate(VII) =0.0476Mx2.07% =0.001 M Conclusion: Concentration of potassium manganate(VII) in mol dm-3=0.048�0.001 M ...read more.

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