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

Empirical Formula of a Hydrate-CE

Extracts from this document...


Lab#7: Empirical Formula of a Hydrate-Laurie Chan 11/13/2008 Conclusion and Evaluation: Aspect 1 Based on the interpreted data of group "A", the empirical formula of aluminum chloride did not stay the same. The expected empirical formula was. In group "A" the empirical formulas are as followed... Group Name Empirical formula Laurie & Jordan Rica, Victoria & Stephanie Vince & Josh Jane & Kaityln So, as a group, we all had a different outcome of the empirical formula but the percent composition of water is the same for all. 11.2% for hydrogen and 88.8% for oxygen as shown in table #7.3. A random error would be the measurement of the hydrate crystal. A scoopula was used to measure 3g. ...read more.


There wasn't an accurate measurement so that could've affected the weight of the final product or the reaction of the product. Another weakness was that the evaporating dish was being heated through a wire mesh instead of a clay triangle. The wire mesh had a white coating on it, so therefore the evaporating dish was being heated indirectly and the wire mesh would absorb the heat itself. This would affect the heating process of the evaporating dish and the substance inside of it. There were a few assumptions made in this particular lab. They are as followed... Assumption Possible effect on the result All of the moisture was removed from the evaporating dish If all the moisture wasn't removed, then an accurate and precise reaction isn't obtained. ...read more.


Although, the same balance was used to weigh all the masses, therefore the accuracy of those measurements were present with the exception of the uncertainty�0.001g. Aspect 3 If this lab were to be redone, I think that everything should stay the same besides 2 factors which are the use of wire mesh and the measurement of the hydrate crystal. If we were to use a clay triangle instead of the wire mesh, the evaporating dish would have been directly heated instead of being indirectly heated. This would remove the systematic error. A better precision and accuracy would be obtained if we actually used a measuring device. For example, a measuring spoon would've been more accurate than the scoopula. Using the same balance for all masses would obtain greater control of variables and reduce the random error. ...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. Experiment - The Empirical Formula of Magnesium Oxide

    However, it has to be noted that some of the results gained were controversial to each other, i.e., in one particular case, the calculated empirical formula of magnesium oxide is Mg4O. From Table 3 and Table 3.1, the possible empirical formulas for magnesium oxygen were: MgO, Mg2O or Mg4O.

  2. Lab 1 - Determining Hydrate Formulas

    Sulfate (ZnSO4) 18.54g There is none because I used a digital device to determine the mass, so I can't have possibly made any mistakes. Mass given by weighing machine in grams (g) � 0.005g *Percent of Uncertainty = (absolute uncertainty) � actual weight)

  1. Determining the Formula of an Unknown Hydrate

    The percentage error for the Copper (II) Sulfate was 4.61%. It is a large error but the coefficient was correctly rounded to the accepted value of 5. The percentage error for Epsom salts was 5.51% which is also very large but can also be rounded to the accepted value of 7.

  2. Investigating the formula of an unknown hydrate

    Repeat step 3 until the mass is constant Controlling the variables: - The same materials were used . - The same substance was used. Safety: - Always handle the crucible with crucible tongs. - Tie back long hair when using Bunsen burner. - Never leave a lighted burner unattended.

  1. 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.

  2. Determining the Formula of an Unknown Hydrate

    The amount in moles of the water of hydration: Trial 1 Trial 2 5 5 The amount in moles of the dehydrate salt: Trial 1 Trial 2 4 5 4.

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