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

Calculate % of caco3 in white egg shell

Extracts from this document...

Introduction

´╗┐Anant Sultania Teacher?s Instruction Determine the composition of the eggshell. Aim To find the percentage purity of Calcium Carbonate in an egg shell Variables Independent variables: mass of calcium carbonate in eggshell The mass of calcium carbonate in the egg shell will be constant as the shell is taken form one egg itself. Dependent variables: number of moles of hydrochloric acid used The number of moles of that reacts with the calcium carbonate will vary according to the mass of calcium carbonate that is present in eggshell. Control variable: concentration of sodium hydroxide The concentration of is used for titration is kept constant this will give the accurate measurements of the amount of that did not react with the calcium carbonate Apparatus 1. Mortar and Pestle 2. Standard Lab Balance 3. Hot Plates 4. 200ml beaker 5. Graduated measuring cylinder (10ml, 100ml) 6. Pipette 7. Burette 8. Conical Flask Reagents Used 1. Eggshell 2. 3. 4. Phenolphthalein Procedure 1. Carefully wash the shell of an egg to remove any dirt and organic matter attached to it. ...read more.

Middle

At this point stop the flow of sodium hydroxide. 7. Note down the reading that is shown on the burette. Data collection And Processing The following table shows the data that was collected: S. No. Volume of NaOH used./±0.5cm3 1 20.5 2 21.1 3 20.3 4 20.4 5 20.9 6 20.3 The average of sodium hydroxide that was used to neutralize the hydrochloric acid is: The error in the average value is: The process of back titration can be used to find out the mass of The two reactions that occur during the process are: We can see from the above equation that of reacts with of Finding the number of moles of sodium hydroxide: Therefore: The total amount of that was taken is: The error here is as the least count on a measuring cylinder is and the final error is Now the amount of that reacted with can be calculated by: of reacts with of therefore of will react with The value is Now moving on to calculate the percentage purity of in eggshell: The error in the percentage purity is: This error ...read more.

Conclusion

This again results in an increase in the error in the experiment and thus this is the flaw that is present in the procedure. When the reacted solution of the salt and the acid is diluted the concentration of the unreacted acid decreases and the error is increased even further. The most significant error in the percentage purity was caused by the measuring cylinder. As every time a measure of of was taken it was not accurate and this resulted in the varation in the amount of that was neutralized each time. The improvements that can be added to the experiments will be: 1. Using a dropper to measure an accurate amount of the solution so there is a minimum of variation in the calculated values. 2. Titrating about of solution as it is easier to isolate form the total solution and at the same time the results will improve and there will be a reduction in the uncertainty of the experiment. 3. The titration should be carried our very carefully so that excess of is not used and thus the result will be more accurate. With these improvements one should attain a more accurate result. ________________ | Page ...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. Calcium Carbonate and Hydrochloric Acid

    The powder experiment has lost approximately 5 times more weight than the chips experiment after 90 seconds, meaning that more product was formed in the powder experiment, hence the reaction rate of the powder experiment is higher that chips experiment.

  2. Aim: To calculate the activation energy (EA) for the reaction between Br- and BrO3- ...

    This is done by adding a limited amount of phenol and the dye methyl red to the reaction mixture, the bromine reacts very rapidly with the phenol to form tribromophenol. This is expressed in the following equation: Once all the phenol has reacted, the excess of Br2 is released by the reaction.

  1. pKa. When constant successive portions of Sodium Hydroxide are added to Acetic Acid; how ...

    Hands were washed before leaving the laboratory. 17. By the results gathered, a Titration curve can be drawn. The pH would simple be on the y axis while the volume of the base would be on the x axis. The pKa can be determined by finding the pH halfway to the endpoint of the Titration curve.

  2. How much calcium carbonate is in an eggshell

    This is no doubt the result of the formation of CO2 gas. Once this reaction was complete, NaOH was added to the solution to neutralize the acid and to enable calculation of the amount of acid used in the reaction.

  1. Determining the Concentration of Calcium Carbonate in an Unknown Substance through the Methods of ...

    50.00 50.00 50.00 50.00 *To increase the results, trial 3 and 4 was taken from another group to get more data, thereby increasing the accuracy of the data. Qualitative Data Descriptions of the Substances Used and Produced Sodium Hydroxide Clear solution, low viscosity, slippery Ethanoic acid Clear solution, acidic, Phenolphthalein

  2. Aim: To estimate volumetrically the amount of Calcium carbonate present in the eggshell

    We took care of not letting any piece of shell be unreacted. And then we added 2-drops of phenolphthalein indicator we titrated the contents of the flask with the standardised NaOH solution, Again the end point of the titration was change in colour from colourless to (pink), we recorded the volume of NaOH consumed.

  1. FInding the percentage purity of CACO3 in egg shell

    The amount of NaOH that has to be used is calculated before the experiment is done in order to know the exact amount of alkali that will be required to neutralize the base. The concentration is calculated by finding a good orientation of the number of moles that will react with the volume that will be needed.

  2. Acid Base titration to determine the percentage by mass of calcium carbonate in an ...

    observing the graph because in this case we titrate a weak acid with a strong base, so as it appears in the graph, at the beginning, big amounts of sodium hydroxide is needed to produce a small change in the pH, when is closer to seven the pH level suddenly

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