Physic Lab Report Essay

NAME : ZULHAIRI BIN MAMAT DATE : 24 AUGUST 2011 TITLE OF EXPERIMENT : DETERMINATION OF THE RELATIVE MOLECULAR MASS OF AMIDOSULPHURIC ACID DATA COLLECTION AND PROCESSING. QUANTITATIVE DATA Type equation here. Experiment| Burette reading / cm3| Volume of solution used(±0. 1 cm3)| | Initial reading(± 0. 05 cm3)| Final reading(± 0. 05 cm3)| | 1| 0. 00| 24. 70| 24. 7| 2| 18. 20| 48. 00| 29. 8| 3| 6. 00| 33. 00| 27. 0| QUALITATIVE DATA 1.

When amidosulphuric acid was diluted with distilled water, the beaker feel cold. 2. When the phenolphthalein indicator was dropped into the solution, the solution colour does not change and remain clear. 3. When the diluted amidosulphuric acid was titrated with the sodium hydroxide solution, the colour of the solution turns to pale pink and it is called as end point.

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Mass of amidosulphuric acid powder = 2. 5050 g ± 0. 0001 g CALCULATION Average volume of sodium hydroxide solution used = =First reading+Second reading+Third reading3 24. 7 + 29. 8 + 27. 0 3 = 27. 2 cm3 = 27. 2 cm3 ± 0. 1 cm3 Chemical equation : H3NSO3 + NaOH > NaH2NSO3 + H2O No of mole of sodium hydroxide, n=Molarity of solution ? Volume of solution1000 = 0. 1 ? 27. 21000 = 0. 002720 mol 1 mole of NaOH react with 1 mole of H3NSO3 So, 0. 002720 mol of NaOH react with 0.

002720 mol of H3NSO3 Molarity of 250 cm3 amidosulphuric acid , M=1000 ? No of moleVolume of solution = 1000 ? 0. 002720 250 = 0. 0109 mol dm-3

Relative molecular mass of 250. 00 cm3 amidosulphuric acid, RMM= Mass of compoundNo of mole of compound? 10 = 2. 50500. 002720 = 92. 20 g mol-1 ERROR ANALYSIS Table of measuring instruments uncertainties Measuring instrument| Uncertainties| 50. 00 cm3 burette| ± 0. 05 cm3| 25. 00 cm3 pipette| ± 0. 03 cm3| 250. 00 cm3 volumetric flask| ± 0. 15 cm3| Analytical balance| ± 0. 0001 g| 1. Burette = 0. 127. 2 ? 100% = 0. 3676 % 2. Pipette = 0. 0325. 00 ? 100% = ± 0. 1200 % 3. Volumetric flask = 0. 15250. 00 ? 100% 0. 06000 % 4. Analytical balance = 0. 00012. 5050 ? 100% = 0. 004000 % Total percentage error = 0. 3676% + 0. 1200% + 0. 06000% + 0. 004000% = 0. 5516 % Absolute error = 0. 5516 ? 92. 20 100 = ±0. 5086 g mol-1 CONCLUSION AND EVALUATION From the experiment, the relative molecular mass of amidosulphuric acid obtain is 92. 20 g mol-1 ± 0. 5086 g mol-1. The total percentage error from the instrument is 0. 5516%. The experimental value obtain is smaller than the theorical value of the acid which is 97. 1 g mol-1. This different are most likely from the systematic errors and also random errors during the experiment . The errors are may come from: 1. There are some of the powdered amidosulphuric acids left at the weighing bottle. 2. There are parallax error when the observer taking the reading of sodium hydroxide solution in the burette. 3. Overshot happen during the titration which effects the amount of sodium hydroxide use to neutralize the amidosulphuric acid. The errors can be reduce by: 1.

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