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

Determining the Concentration of Limewater Solution

Extracts from this document...

Introduction

Determining the Concentration of Limewater Solution Aim The aim of this experiment is to find the concentration of 250 cm3 of limewater solution, which has been made such that it contains approximately 1g dm-3 of calcium hydroxide. I am required to design my own experiment and choose a range of appropriate equipment and apparatus. The indicator will be supplied to me. Also available is hydrochloric acid which has a concentration of exactly 2.00 mol dm-3, this concentration is too much though so it is necessary to dilute it. Apparatus & Chemicals The apparatus, equipment and chemicals that I will use are as follows: - 1) Pipette 25cm3 2) Volumetric flask 250cm3 3) Conical flask 250cm3 4) Burette 5) Funnel 6) Clamp and stand 7) Indicator (methyl orange) 8) Limewater (250cm3 with 1g dm-3 of calcium hydroxide) 9) Hydrochloric acid (concentration 2.00 mol dm-3) 10) Distilled water Risk Assessment When carrying out any experiment in a laboratory a lab coat must always be worn. 1. Chemical Hazards Name Hazard Precautions Hydrochloric Acid The HCL we are using is very dilute and therefore is not corrosive but is an irritant. ...read more.

Middle

This would require a dilution factor of 100. I will be making 500 cm3 of dilute hydrochloric acid. Accuracy To reduce any errors it is necessary to choose accurate and reliable equipment. That is why I have chosen the pipette, volumetric flask and burette. All of these instruments have an accuracy of 0.05%cm3, 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 and as the chemicals used are corrosive it is important to take extra care while working around them. ...read more.

Conclusion

* Make sure the tap of the burette is closed (horizontal position). * Place a funnel at the top of the burette. * Pour the HCl through the funnel into the burette filling it just above the 00cm3 mark. * Place the beaker beneath the tap and open it (vertical position), till it fills up and passes through the 'dead' space beneath the tap. This process should rid the burette of any air bubbles. * Measure and record the reading of the meniscus of the HCl in the burette. * Remove the beaker and place the conical flask containing the limewater beneath the tap. (Position yourself in a comfortable manner so that your eyes are level with the conical flask). * Open the tap by turning it to its vertical position, keeping one hand on the tap ready to close it as soon as the colour change occurs, and the other hand continuously swirling the conical flask. * Close the tap as soon as the colour changes from light orange to pink, and read and record the volume of dilute hydrochloric acid used to neutralise 25.0 cm3 calcium hydroxide (limewater). 1In order to obtain consistent and reliable results it is necessary to have carry out the titration again and again until two concordant results are found. ...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)

    and 1 atmosphere (atm), respectively. An enthalpy change measured under these conditions is described as standard enthalpy change and given the symbol ?H ?or ?H ?298 with a special superscript and subscript. The symbol ?H ?298 also implies that: All the substances involved in the reaction are in their normal

  2. The Use of Volumetric Flask, Burette and Pipette in Determining the Concentration of NaOH ...

    Calculations will be based on the following formula: (Volume of acid)(molarity of H+) = (volume of base)(molarity of OH-) Or, more simply VaMH+ = VbMOH- Knowing three of these quantities we can calculate the fourth -- in this case the molarity of the acid's hydrogen ions.

  1. Find the concentration of limewater solution Titration

    a damp paper towel and then mop up using a dry paper towel. The indicator being used, if it is methyl orange, also has its dangers so it should be stored in a sealed container in a cool environment. When using the methyl orange ensure that all doors and windows are open to provide good ventilation in the room.

  2. The Use of Volumetric Flask, Burette and Pipette in Determining the Concentration of NaOH ...

    * Phenolphthalein solution * Beaker (500cm�) * Burette(50cm�) * Pipette(20cm� or 25cm�) * Volumetric flask (250cm�) * Funnel * Watch Glass * Erlenmeyer flask(250cm�) Procedures: 1. The volumetric flask is cleaned and rinsed with distilled water. 2. All NaOH solution is transferred into the volumetric flask using funnel and the remaining NaOH solution is washed into the flask several times using distilled water.

  1. determining the concentration of a limewater solution

    as possible. This is because the temperature of the room can cause liquids to expand or shrink in size, and this can affect the accuracy of the experiment. This will help to keep the volume of the limewater constant at 30.00cm�.

  2. The aim of my experiment is to find the exact concentration of limewater. In ...

    The burette level should be read to two decimal places (the bottom of the meniscus should be read). This value should be recorded before starting the titration. A conical flask will now be taken and will be thoroughly rinsed by distilled water to remove any impurities present within the flask.

  1. Determine the concentration of a limewater solution.

    On the next page there is a diagram of the graph demonstrating this type of reaction. Indicators There are many indicators that could be used in titrations, but as every indicator had different ranges we need to determine a range of indicators that will be suitable for the experiment.

  2. Determine the concentration of lime water.

    Also by choosing relatively accurate instruments I minimise error through instrument limitations. The pipette, volumetric flask and burette have an accuracy of approximately � 0.05cm3, this is far more accurate when compared to that of the burette which has an accuracy of �5.00cm3.

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