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

The aim of this experiment is to find the concentration of a sample of limewater solution in g dm3.

Extracts from this document...

Introduction

Chemistry Plan The aim of this experiment is to find the concentration of a sample of limewater solution in g dm3. I am required to design my own experiment and choose a range of appropriate equipment and apparatus. I am provided with 250 cm3 of limewater, which has been made such that it contains approximately 1g/dm3 of calcium hydroxide. Also available is hydrochloric acid which has a concentration of 2.00 mol dm3, this concentration is too much though so it is necessary to dilute it. The apparatus, equipment and chemicals that I will use are as follows: - 1) Pipette 25cm3 2) Volumetric flask 500cm3 3) Conical flask 250cm3 4) Burette 5) White tile 6) Clamp and stand 7) Indicator (methyl orange) 8) Limewater (250cm3 with approximately 1g/dm3 of calcium hydroxide) 9) Hydrochloric acid- standard solution (conc. 2.00 mol/dm3) 10) Distilled water Slaked lime dissolved in water is called limewater. ...read more.

Middle

That is why I have chosen the pipette, volumetric flask and burette. All of these instruments have an accuracy of �0.05cm3, which is suitable for my experiment and should produce accurate and reliable results. In making my choice of indicator I also had to be very careful. The Limewater used will be a relatively weak base so it will be appropriate to use methyl orange as it has an end point on the ph scale between 8-5. Whereas phenolphthalein indicator has an end point much higher up in the ph scale. So if I were to use the phenolphthalein indicator then the end point (colour change) would be reached before the equivalence point (when the chemicals, acid-base break up). Implementing Safety is very important and it is necessary to follow safety procedures. It is important to wear eye protection when working with any acid. Also long hair should be tied back. ...read more.

Conclusion

When the indicator is added the colour of the solution is light, clear, orange and this should turn to pink by the end of the titration. In order to obtain consistent and reliable results it is necessary to repeat the experiment 3 times at a minimum and if the results were not in 0.1 of each other then further experiments would be needed. 0.1 is the figure that I have used as it is the accuracy of the burette. After this it the results must be noted in a table complete with the correct units. Using these results we first apply this formula Number of moles= concentration*volume(dm3) to the Hcl as we know its amount and concentration so can work out its number of moles. We then look back at the balanced equation and see the reaction ratio. In this case it is 2 moles of Hcl to 1mole of Ca(OH)2. So we times this number by 2 and we have the number of moles of limewater. ...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 Aqueous 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 GCSE Aqueous Chemistry essays

  1. Marked by a teacher

    Enthalpy of Neutralisation.

    3 star(s)

    CH3COOH 1000 = 0.025 moles = 1.945 0.025 = -77.7Kj mol -1 Percentage error = actual yield - theoretical yield x 100 Actual yield 1 = -57.1 - (-77.7)

  2. Antacid Experiment.

    results that I had predicted but we did not and so things must have gone wrong. The temperature of the water may have been different whilst recording the results for one tablet to another. If the water was warmer than I think that the results would be higher than expected

  1. Aim/Objective: To find out the dissolved oxygen content (in mg dm-3) in a water ...

    When filling small amount of solution into the volumetric flask using dropper, the dropper should be immersed well below the water surface, to ensure that the added solution could react with the water sample. If the solution was added onto the top of the solution, overflow will occur, and the content overflowed would be the added solution.

  2. The Concentration of Limewater Solution.

    be rinsed as residue from previous trials would contaminate the limewater and make the results il1accurate. 12. Use an average of the two results that are within 0.10cm3 of each other to calculate the exact concentration of the limewater in 1.00dm-3.

  1. Find the concentration of a sample of limewater solution in g dm3.

    The Limewater used will be a relatively weak base so it will be appropriate to use methyl orange as it has an end point on the ph scale between 8-5. Whereas phenolphthalein indicator has an end point much higher up in the ph scale.

  2. Determine the concentration of a limewater solution.

    Ca Va y = Cb Vb x The letters now have to be replaced with the appropriate values. Ca x 10 x 2 = 0.02 x 17.45 The final stage involves arranging the equation so that Ca is on one side of the equals sign alone.

  1. determining the concentration of a limewater solution

    I will be using the following apparatus in my procedure: Dilution Apparatus: 500.00cm� conical flask 250.00cm� volumetric flask 1.00cm� glass pipette 50.00cm� glass pipette Pipette filler 2.00 molar hydrochloric acid Titration Apparatus: 30.00cm� bulb pipette Pipette filler 50.00cm� burette 25.00cm� conical flask Funnel Phenol phthalein indicator solution 250.00cm� limewater containing

  2. Find out the accurate concentration of an aid solution thought to have a concentration ...

    Using the funnel and glass beaker containing the 0.1 mol dm3 sodium carbonate solution fill the burette until it is just over the 50 cm3 mark. Now place the beaker with the acid solution in it beneath the burette and whilst keeping your eye-level opposite the meniscus open the tap

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