• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

Chemistry Lab Report Stoichiometry

Extracts from this document...

Introduction

Chemistry SL Experiment No 2: Stoichiometry (1) Nat�lia T�thov�, 3. IB A Experiment No 2 Topic: Stoichiometry (1) Aim: Determine the number of molecules of water in copper sulphate hydrate. Results: Raw Data: Uncertainty of weighing scale : � 0.05 g Mass of dish (g) Mass of dish and sample of hydrated CuSO4 (g) Mass of dish and sample of non-hydrated CuSO4 (g) 1st trial 77.3 83.9 81.7 2nd trial 72.2 87.2 82.0 3rd trial 77.4 84.1 81.7 The sample of hydrated CuSO4 was in a solid state. It had a crystal texture and it was blue. After being heated for several minutes the copper sulphate turned into a white powder became non-hydrated (anhydrous). Uncertainty of weighing scale : � 0.05 g Mass of sample of hydrated CuSO4 (g) Mass of sample of non-hydrated CuSO4 (g) Mass of H2O in sample of hydrated CuSO4 (g) ...read more.

Middle

Mass of CuSO4 (g) Molar mass of CuSO4 (g/mol) Mass in moles of CuSO4 (mol) 2.4 18.02 0.13 4.3 159.61 0.027 For CuSO4. x3H2O = 4.8 Average = 4.7 Conclusion: The aim, to determine the coefficient of water in the formula for copper sulphate hydrate, was achieved. To get a more true result the experiment was repeated three times and an average was calculated. This average amounted to 4.7, which comes very close to the actual coefficient, which is 5. When I look at the result for the 2nd trial and the 3rd trial they are identical (however the 1st is not). This proves that we were quite precise if not that accurate. Evaluation: Though the experiment was very straightforward, errors have been made and there was sill space left for improvement. To start off, I would have to say that my preparation for the lab was insufficient. ...read more.

Conclusion

This had a slight effect on the mass. This could easily be avoided if we had taken more care with choosing the equipment and making sure it was fit to be used (cleaning it). The weighing scale used measures to one decimal place which doesn't the result very accurate. The readings were used in the calculations and so according to the rule of significant figures the result were given in two significant figures. Since more than one calculation was done to get the final result, this would cause the results to be less accurate than desired. If possible, a scale measuring to two decimal places would be helpful in being more accurate. The experiment could be improved by performing two more trials, making the total five. Since three repetitions is the minimum for subsequent average calculations, this would only help to make the experiment more factual. But then again this would require more time, which we did not have at the time. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Chemistry section.

Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

Related International Baccalaureate Chemistry essays

1. Chemistry Lab Report. AIM: To calculate the number of molecules of water of ...

- When copper sulphate becomes a white anhydrous powder it means that it has lost its water of crystallization. At that time stop heating and let the crucible cool.

2. IB Chemistry - Boyle's Law Lab Report

According to the formula, the pressure of a book had 251g/cm� (1440/5.73 = 251g/cm�). Therefore, the pressure will be constantly changed by the number of books. It is not the end of the pressure. I had to add the total pressure on the piston equals the pressure from the books plus the atmospheric pressure.

1. IB Chemistry - Charles' Law Lab Report

that the temperature and the height were directly related. To find the height, I had to subtract the scale of the end of capillary from the scale of the bottom of bubble. And, for the temperature, all I had to do was just read the scale of thermometer per 10?.

2. IB chemistry revision notes

Nitrogen's is similar to Neon's. * Down a Group o Down any group the ionic radius increases as there are more electrons in more shells, which are further from the nucleus and with more shielding. E.g. Li+, Na+, K+ o As we go down the groups, the outermost electron

1. Indicator Lab Report - investigating acid-base reactions

as well, but, theoretically, less NaOH would have needed to be added due to the lesser concentration of H+ ions compared to the first experiment. In the third graph (strong acid and weak base) no apparent equivalence point can be observed.

2. IA - Lab Report. Aim to prepare a sample of p-nitro acetanilide from the ...

acid * Concentrated acid * Concentrated sulfuric acid * Fuming metric acid * Methylated spirit * Ice cubes * Chilled water PROCEDURE * Preparation of the salt solutions o Weigh 5 g of acetanilide powder in a watch glass with the help of an electronic weighing machine and add this to a 100 cm3 conical flask.

1. Electrolysis of copper sulphate

adding the mass deposited on each of the five cathodes in each of the 6 trial and dividing by 5. E.g. C1+C2+C3+C4+C55= average mass deposited 3. Graph the data and compare results to theoretical calculated mass values according to faraday?s law Results Trials Current (amps)

2. Research report on Stoichiometry

Stoichiometry helps you figure out how much of a compound you will need or maybe how much you started with. We want to take the time to explain that reactions are dependent upon the compounds involved and how much of each compound is needed. • Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to
improve your own work 