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


Extracts from this document...


DETERMINATION OF WATER OF CRYSTALLIZATION Student: Vu Cuong Nguyen School: Auckland International College Due date: Wednesday 15th August 2007 I. Aim: To determine the formula of the hydrate of copper (II) sulfate. II. Hypothesis: Hydrates are ionic compounds that have a definite amount of water as part of their structure. The water is chemically combined with the salt in a definite ratio. Ratios vary in different hydrates but are specific for any given hydrate. In this experiment, the hydrate of copper sulfate has the formula CuSO4.xH20. When it is heated, the water is released as vapor and we can describe the reaction as below: Hydrate Anhydrous salt + Salt CuSO4.xH20 CuSO4 + xH20 The amount of water in the hydrate is determined by taking the difference between the mass of the hydrate before and after heated. ...read more.


2. Set up a Bunsen burner under a tripod stand with a pipe-clay triangle on top. 3. Place the empty evaporating dish on the clay triangle and heat the dish with the hottest flame for 3 minutes. This is done to be sure that the dish is absolutely dry. 4. Use tongs to remove the dish from the clay triangle and then place it on a pressed fiber pad so that it can cool for several minutes. 5. Use a digital balance to determine the mass of the cooled evaporating dish. Record this mass to the same number of decimal places as the uncertainty of the balance (±0.001g), in other words, the measured mass will have 3 decimal places. Remember not to weigh the dish when it is hot because heat waves tend to be circular and upward, which tends to make objects appear to weigh less. ...read more.


If the edges of the solid appear to be turning brown, remove the heat momentarily and resume heating with a cooler flame. 9. Allow the dish to cool for 2 minutes. Immediately find the mass of the dish with the anhydrous salt, and record the mass to the same number of decimal places as the uncertainty of the balance. The dish must be weighed before the compound reabsorbs water from the atmosphere. 10. Calculate the initial amount of hydrated copper sulfate before heated. Record the answer to the same number of decimal places as its calculated uncertainty. 11. Determine the amount of vaporized water. Record the answer to the same number of decimal places as its calculated uncertainty. 12. Then, the value of x can be found basing on the formula ratio. 13. When finish, the anhydrous salt can be thrown into the waste container and the evaporating dish washed. ...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. Atomic Structure Notes

    For example, microwave ovens emit energy at a frequency of 2.45 x 109 Hz, which corresponds to the energy needed to rotate the water molecules in food. Infrared energy Infrared energy in the range 1 x 10-20 to 1 x 10-19 J causes changes in the level of vibrational energy of bonds.

  2. Lab 1 - Determining Hydrate Formulas

    heated (because this is the maximum times I could have heated it because of our teacher's orders), mass of the crucible with the lid, and the mass of the dehydrated Zinc(II) Sulfate (ZnSO4) salt. These 4 variables helped me to determine the formula of the Zinc (II)

  1. Percentage of Water In Popcorn

    Beta 3.383 g 118.002 g 118.002 g 117.626 g Burns very easily, produces very small popcorn Gamma 3.506 g 112.227 g 112.227 g 111.690 g Produces the largest popcorn, popped easiest Delta 4.210 g 115.003 g 115.003 g 114.188 g Produces medium-sized popcorn Trial 2 Mass of Kernels (±0.001 g)

  2. Chemical monitoring and management - composition of the atmosphere and the problems of pollution.

    The picture below shows a leaf discoloured by ozone molecules. 4. State the common name , correct iupac name and the correct formula of two cfcs Common name : Freon Iupac name : dichlorodifluoromethane Common name : HCFC-124 Iupac name: chlorotetrafluoroethane 5.

  1. PURPOSE To determine the amount of water of crystallization in one mole of a ...

    Turned off the burner. 5. Reweighed it when the crucible has cooled 6. Gently heated the crucible for 3 more minutes, allowed to cool and reweighed. If the mass was the same as the first weighing, I stopped. If the mass had changed, continued gently heating and cooling until the mass does not change.

  2. We can conclude that the experiment gave a reasonably accurate value for the number ...

    x 100% = 0.8 Total uncertainty= 2.49% approx Thus, the number of moles of water of crystallization in oxalic acid = 1.72 to 3 sig fig +/- 2.49% = 1.72 to 3 sig fig +/- 0.0428 The literature (true)

  1. The chemistry of atmospheric and water pollution.

    Because of the destruction of ozone by CFCâs in the stratosphere, there are major implications for life on earth. Ozoneâs major role is to protect life on earth by absorbing dangerous and harmful UV radiation from the sun. Since it has been destroyed, the UV radiation is able to enter the lower atmosphere including the troposphere.

  2. Testing the Suitability of Pool Water. The expected amount of chlorine which is ...

    This solution was then left for about one day before we began the experiment. 2) On the day of the experiment, we began testing the pool water, by first checking its pH level. This was done by putting a little of it in a test tube and adding a few

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