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

Aim: To Determine The Concentration Of a Limewater Solution

Extracts from this document...

Introduction

Aim: To Determine The Concentration Of a Limewater Solution I am going to perform an experiment in which will allow me to determine the concentration, in g dm-3, of limewater given to me containing approximately 1g dm-3 of calcium hydroxide. I will be performing a simple neutralisation reaction, using HCL, to determine the concentration. I will carry out a titration to determine this. 250cm3 of limewater will be given and the HCl provided is exactly 2.00mol dm-3. Background Information (Essential AS Chemistry) Limewater is formed when slacked lime is dissolved in water. The process is started by the vigorous reaction between calcium oxide (limestone) and water. This forms calcium hydroxide (slacked lime). The addition of more water saturates the slacked lime and forms an aqueous solution known as limewater. Equations ACID + METAL HYDROXIDE SALT + WATER Calcium Hydroxide + Hydrochloric Acid Calcium Chloride + Water Ca(OH)2 aq + 2HClaq CaCl2aq + 2H2O Therefore the stoichiometric ratio is 2 : 1, hence 2 mol of HCL are required to neutralize 1 mol of Ca(OH)2. ...read more.

Middle

To calculate the required volume of 2.00 mol dm-3 HCL I will use the calculation below. Initial molarity (Mi) x initial volume (Vi) = final molarity (Mf) x final volume (Vf). (Jim Clark AS calculations). 2.00 x Vi = 0.2 x 0.25 (litres) Vi= 0.2 x 0.25/2.00 Vi= 0.025 (litres) Vi= 0.025 x 1000 = 25cm3 Standardisation Method Therefore, I will, fill up a 25cm3 pipette with HCL and empty into a 250cm3 volumetric flask. I will then top up the flask to the line with distilled water, ensuring the bottom of the meniscus is touching the line. This will give me acid of 0.2mol dm-3, so I will take 25 cm3 of this diluted acid and repeat the method above, consequently giving me 250cm3 of HCL at concentration, 0.02 mol dm-3 . N.B to ensure the diluted acid is thoroughly mixed I will invert the solution several times. Indicator Choice Through research on the internet (wikipedia), I was able to find out that methyl orange would be the best indicator for my experiment. ...read more.

Conclusion

Finally add four drops of methyl orange to the flask. 4. The first run of the titration will be used as a 'range finder', so add the HCL from the burette until there is a distinct colour change. 5. Once this change in colour has occurred take the reading of the burette and minus this away from the initial volume to give you the volume used in the neutralisation reaction. The first reading can be used as a range finder. 6. Repeat the experiment; this time release the acid drip by drip closer to the end point, ensuring the exact end point is recorded. Do this until your results are reliable and you have at least two concordant results. 7. All your results should be recorded in a table for later use in the analysis where you can calculate these. Safety Due to the chemicals used (HCl) lab coats, and safety specs have to be worn at all times. Apparatus Wooden Clamp and Stand Burette 50cm3 Pipette 25 cm3 and pipette filler Distilled Water Volumetric Flask 250cm3 Conical Flask 250cm3 White Tile Funnel Beaker Methyl Orange Indicator 250 cm3 of Limewater 2.00mol dm-3 Hydrochloric Acid ...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)

    Such a reaction is said to be exothermic and the enthalpy change is given a negative (-) sign. If the temperature falls, this means that heat is being absorbed from the surroundings into the system, indicating an endothermic reaction and making ?H positive (+).

  2. Free essay

    To determine the concentration of limewater

    5 star(s)

    * Fill the burette with 50cm of the dilute hydrochloric acid making sure the bottom of the meniscus is reading at 50 on the burette. Using a funnel to put the dilute hydrochloric acid in the burette increases safety against spillage.

  1. Find the concentration of limewater solution Titration

    Error Analysis An error analysis is done on all the equipment that is used. This shows the percentage error in a reading. The higher the percentage error the less accurate the results. The burette has an error analysis of �0.05cm�.

  2. Determine the concentration of lime water.

    I have used a weak concentration of HCl, which is why I have used a concentration of 0.01 mol dm?3 rather than 0.02 mol dm?3. The experiment can be improved by using a computer and a real time video camera.

  1. To determine the concentration of limewater solution

    Read the level on the burette and take this result as rough. Further titrations: Open the tap on the burette and let out less solution which you got for the rough or previous titrations. Then open and close the tap to let one drop out at a time while gently

  2. Determining the concentration of a limewater solution by volumetric analysis

    Now prepare the limewater; first shake the bottle of the limewater so the calcium hydroxide isn't all sitting at the bottom and then using the clean 25cm3 pipette take 25cm3 of limewater and eject it into the 250cm3 conical flask.

  1. determining the concentration of a limewater solution

    Hydrochloric acid also reacts very strongly with certain metals such as calcium and must not be kept or stored any where near them. Due to these factors, goggles must be worn at all times. It is also advisable to wear a lab coat and latex gloves.

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

    Therefore it is important to wear safety glasses when dealing with HCl and also handle it with care. If the chemical comes into contact with eyes or skin just rinse with water quickly. Another chemical being used is Calcium hydroxide solution (limewater)

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