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

An investigation into the water of crystallisation present in Hydrated Magnesium Sulphate

Extracts from this document...


An investigation into the water of crystallisation present in Hydrated Magnesium Sulphate Aim The aim of this experiment is to investigate the amount of water of crystallisation is present in the hydrous powder, and to investigate whether or nor the substance is MgSO4.7H2O Hypothesis I predict that if I take a mass of approximately 2.46g of hydrated magnesium sulphate and decompose it by heating until all of the water of crystallisation has been driven off, I should be left with a mass of approximately 1.2g anhydrous Magnesium Sulphate. This size of the starting mass was chosen because it is both practical to the experiment, due to limited time and supplies, but large enough to create accurate readings on a 3 decimal placed set of scales. Calculating the molecular masses of the anhydrous substance created the figures 246 and 120. These calculations follow: Equipment Apparatus Bunsen burner; Heatproof mat; Tripod; Pipe clay Triangle; 10 g Hydrated Magnesium sulphate; Crystallising dish; Sensitive scales; Tongs; Scoop; Stopwatch; Gas supply; Goggles. Diagram Method Firstly, a crystallising dish's mass will be measured on the scales, and will be recorded. Next, approximately 2.46g of Hydrated Magnesium sulphate will be placed into the Crystallising Dish using the scoop. ...read more.


It is also important to wear goggles in case any hot substances spark off the crystallising dish. Experimental Report An unknown labelling error caused the two substances used in the experiment to differ. This did not change the procedure at all, but it did mean that the average result would simply lie between the two substances rather than be a more accurate result. However, it did soon become clear that heating the substance and fully removing all water was going to take more than 5 minutes, so this period of the experiment was extended to 15 minutes when it was repeated. Table of Results Results set: Total mass (g) Mass of Crucible (g) Mass of Magnesium (g) Mass change (g) % Mass change (to 3 S.F.) Start End Start End 1 15.081 12.467 10.06 5.075 2.407 2.668 52.6 2 36.210 35.992 35.695 0.515 0.297 0.218 42.3 Average / / / / / / 47.45 Analysis MgSO4.xH2O reference table X Molecule MgSO4.xH2O Mr (RMM) of hydrated molecule Mr of the water % of mass that is water Predicted % that would remain 0 MgSO4 120 0 0 100 1 MgSO4.H2O 138 18 13.04348 86.95652 2 MgSO4.2H2O 156 36 23.07692 76.92308 3 MgSO4.3H2O 174 54 31.03448 68.96552 4 MgSO4.4H2O 192 72 37.5 62.5 5 ...read more.


Evaluation If this experiment were to be repeated, there could be a number of amendments to improve the accuracy of results. Firstly, it would have been repeated three times to allow a further error check in case one of the experiments again went wrong. The experiments would also have used the exact same substance allowing averages and anomalous results to be identified, allowing more accurate results to be produced. However, the experiment did produce a result, that the second substance used was MgSO4.5H2O. This is what is suggested by the data, but the data is not very reliable due to there being no way to check the data to see if it was accurate as two completely different chemicals were used. Had the experiment and one chemical was used the results could be declared more accurate and more reliable. This experiment provided a very accurate result, as it fit nearly perfectly with the reference table, but there was no way to prove this was not just co-incidence as the first results were completely unreliable and unusable. But due to the presence of one result that could be backed up by the scientific evidence of relative molecular mass', it is fair to call this experiment a success. 1 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Classifying Materials 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

See related essaysSee related essays

Related GCSE Classifying Materials essays

  1. Determining the water of crystalisation

    Calculating the number of moles of dehydrated CuSO4 and H2O Number of moles = mass of substance / molar mass of the substance * CuSO4 N = (04.60g)/(159.58 g * mol-1) = 0.03 mole [? 0.0001 mole] %uncertainty = 0.43% 0.43%0.03 mole = 0.0001 mole * H2O N = (02.62g)/(17.99 g * mol-1)

  2. Free essay

    Periodic table

    when silver is removed from silver nitrate solution by putting copper in it. Combustion Reactions - when a substance reacts with oxygen and heat is released Decomposition Reactions - when one single compound breaks down into two or more simpler chemicals Combination reactions

  1. Our experiment consisted of two samples of water containing unknown substances, and our objective ...

    Ions Ions are positively or negatively-charged atoms. Electron carries a charge of -1, a proton +1; so if there are fewer electrons and more protons then the overall charge of the atom will be positive. If an atom loses electron(s), it is positively charged and is called a cation.

  2. factors affecting the errosion of a magnesium statue

    This diagram consists of H+ ions and magnesium ions. The H+ ions are bombarding the magnesium ions. The amount of collisions is in few numbers as the concentration of acid is low. This is a proportional reaction. This diagram also consists of H+ ions and magnesium ions. The H+ ions are also bombarding the magnesium ions.

  1. Determination of the formula of Hydrated Iron (II) Sulphate Crystals

    * Moles of Fe2+ = 0.00019*5 o = 0.00095mol I titrated the FeSO4 of 25cm3, however because it was diluted up to 250cm3 I will have to multiply the moles by 10. * Moles of FeSO4 = moles of Fe2*10 o = 0.00095*10 = 0.0095mol Firstly, I will find the

  2. The role of mass customization and postponement in global logistics

    This major trend is affecting all industries - from automotive to computers - and for those who deal with textiles in particular, from apparel to furniture. The goal of Mass Customization (MC) is to design, manufacture and deliver customized products without losing any of the benefits of Mass Production.

  1. To conjecture the structure and bonding of eight unknown solids by analysis of experimentally ...

    substance lightly (or as required to test the ease with which it may or may not deform in any way) with hammer * Record any deformation, shattering or effects of blows * Repeat as necessary to fully observe effects SAFETY: * Take special care that protective glasses are worn *

  2. Investigate a factor that effects the change in temperature between iron and copper sulphate.

    The concentration of the copper sulphate I will keep the volume of copper sulphate the same in this investigation, as it will change the amount of copper molecules, therefore it will affect how much iron it takes to react with all the copper in the solution.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work