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

Determining the Formula of an Unknown Hydrate

Extracts from this document...


Determining the Formula of an Unknown Hydrate Data Collection Table 1. Mass of objects and compounds before and after the experiment. Object/Compound Mass before burning (g � 0.01 g) Mass after burning (g � 0.01 g) Evaporating Dish 23.27 23.27 Copper (II) Sulfate Hydrate CuSO4 4.01 2.60 Epsom Salts, MgSO4 4.00 2.01 Table 2. Qualitative data of compounds before heating Compound Colour Clarity Form Copper (II) Sulfate Hydrate CuSO4 Light blue with dark blue chucks Opaque Powder with small oval chunks Epsom Salts MgSO4 White Opaque Small round chunks Table 3. Qualitative data of compounds after heating Compound Colour Clarity Form Copper (II) Sulfate Hydrate CuSO4 White in the middle, then light blue and olive green around the edge Opaque Powder Epsom Salts MgSO4 White Opaque Harden power Sample Calculations Calculating Molar mass of Epsom salts Addition of all atoms' atomic masses in compound Formula: MgSO4 Atomic Masses: Mg- 24.31 g/mol S- 32.065 g/mol O- 16 g/mol (1x 24.31) + (1x 32.065) ...read more.


Molar mass of anhydrate salt (g/mol) Moles of anhydrate (mol) Mass of H2O (g � 0.02) Molar Mass of H2O (g/mol) Moles of H2O (mol) Water to Salt Ratio Copper (II) Sulfate 2.60 159.615 0.0163 � 0.0001 1.40 18.02 0.078 � 0.001 5:1 Epsom Salt 2.01 120.375 0.0167 � 0.0002 1.99 18.02 0.111 � 0.001 7:1 Conclusion The final equations that was concluded after the experiment and the calculations are CuSO4 � 5H2O and MgSO4 � 5H2O. There are 5 water molecules per Copper (II) Sulphate and 7 water molecules per Magnesium Sulphate. The compounds are all hydrates which is a substance that contains water. This occurs when crystals form from the evaporation of an aqueous solution of a salt and water molecules become included into the crystal. The hydrates were heated and lost its water of hydration and made it possible to calculate how much water was in the hydrate and the water to salt ratio. ...read more.


Also we could have also just used sulfate hydrate to observe how adding another element affect the water and salt ratio. Overheating of the substances The hydrates were heated under the Bunsen burner and were left under the heat for too long. This could alter the result by lowering the mass, which would increase the water to salt ratio. Mixing the powder to evenly distribute the heat to prevent overheating the salt. Not letting the substance cool before weighing it This would raise the mass of the anhydrate because the water molecules would not be entirely evaporated making the substance left heavier. Having more patience and letting the salt completely cool before weighing Oval chunks of CuSO4 remain after burning Not all of the water of hydration has been removed which will throw off the result by decreasing the mole of water and the increase the final water to salt ratio. Break up the chunks before heating or while heating. ...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

See related essaysSee related essays

Related International Baccalaureate Chemistry essays

  1. A comparison of various proprieary antacids

    Moles of sodium hydroxide=0.0118 moles �0.21% Initial moles of HCl= 0.0125 moles (� 0.24%) Moles of HCl that reacted with 1.25cm3 NaOH=0.0118 moles ( �0.21%) Moles of HCl that react with the antacid = 0.0125 moles (� 0.24%)-0.0118 moles ( �0.21%)

  2. Using Solubility Rules to Indentify Unknown Solutions

    However, it is important to note that the BaCl2 and NaOH combination, in theory, should not have formed a precipitate. 1cm3 ionic solutions � 0.01cm3 1cm3 unknown solution � 0.01cm3 KCl � MgCl2 Na2SO4 NaOH BaCl2 MgSO4 Unknown A (BaCl2)

  1. IB questions and answers on Atomic Theory

    The knowns can be compared to the unknowns for identification purposes 32. Consider only the first four primary energy levels of a hydrogen atom. The transition that would result in photon of the shortest wavelength would be a) from n = 4 to n = 1 b)

  2. Lab 1 - Determining Hydrate Formulas

    Mass given by weighing machine in grams (g) � 0.005g *Percent of Uncertainty = (absolute uncertainty) � actual weight) � 100 {0.005g (absolute uncertainty) � 15.16g (actual weight)} � 100 = 0.032% Percent of Uncertainty = 15.61g � 0.032% No# 2: Mass of crucible, lid, and hydrated Zinc(II) Sulfate (ZnSO4)

  1. Group 4

    Some alloys are made by melting and mixing two or more metallic elements. The first alloy ever discovered was bronze, it was made of copper and tin, and was discovered during the prehistoric period known as the bronze age. It was originally used to make tools and weapons, but later it has been used for ornaments, bells, statues, and bearings.

  2. Crystallization - Rock candy is collection of sugar crystal.

    A more dilute solutions the air evaporates some liquids; it will be much quicker if your solution is saturated to begin with. If your solution isn't saturated well, it will undo your work. Make a saturated solution by adding your crystal solute (e.g.

  1. Electrolysis of copper sulphate

    8.085 8.092 0.007 0.0046 C2 7.727 7.734 0.007 C3 8.217 8.222 0.005 C4 8.608 8.616 0.008 C5 7.976 7.972 -0.004 C1 0.6 8.081 8.09 0.009 0.0078 C2 7.721 7.039 0.029 C3 8.211 8.217 0.005 C4 8.612 8.622 0.01 C5 7.965 7.974 0.009 C1 0.8 8.08 8.09 0.01 0.0076 C2 7.721

  2. Measuring the fatty acid percentage of the reused sunflower oil after numerous times of ...

    5 times then this ratio must be the same after taking a sample from the fried oil and continuing with the rest of the oil for 10 times (by frying the potatoes 5 times more). It is also 12 ASLAN Özge Cemre D129077 important to not to fry the potatoes

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