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Determination of the concentration of limewater solution

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Introduction

A-LEVEL CHEMISTRY Assessed Practical 2 (AS) DETERMINATION OF THE COMCENTRATION OF LIMEWATER SOLUTION Introduction In the course of this experiment I am going to find the concentration of Limewater in a solution. I am provided with 250cm3 of limewater, the limewater has been made so it contains an approximate 1g dm3 of Calcium Hydroxide, I am going to be provided with Hydrochloric acid (HCl) which will have a concentration of 2.00mol dm3, it is advised that this acid is actually too concentrated and should be diluted. All the equipments will be provided for me such as the indicators for the experiment and my initial plan for this experiment is to design an approach I could take to find the concentration of limewater by choosing a different range of equipment and a safe procedure. I predict that the more the limewater concentration the more calcium chloride and the more water that will be produced. Aim The aim of this experiment is to find the concentration of limewater solution in g dm3 so I am going to find the molarity of ...read more.

Middle

So the whole point of the experiment is to find out the concentration of limewater and this can be done by reacting the Hydrochloric acid with the Limewater and the equation for this is When it comes to deciding which indicator is best suited for the reason you take in to account that some measurements will be determined by colour and the one indicator that come to mind is phenolphthalein because it is mainly used for colour indication. However from my research I found that there another chemical that could also be used for the experiment is 'methyl orange' because this indicator has a relative pH scale which is around 4-7 keeping in mind that the limewater is also a weak acid base so this more suitable compared to the phenolphthalein as it has a higher pH scale compared with the limewater. It is also advisable that the hydrochloric acid to be diluted in order to prevent the reaction from happening too fast. ...read more.

Conclusion

THE METHOD FOR THE EXPERIMENT 1. Firstly set up the apparatus by attaching the clamp and stand supporting the pipette over the volumetric flask, make sure that you wear a protective glove and goggles when dealing with the chemicals. 2. Use the 25cm3 of the aqueous limewater into a 250cm3 conical flask. 3. Use a minimum of 3 drops to a maximum drops of the methy Orange or the phenolphthalein indicators to the limewater. 4. Then titrate with respect to the 0.1mol dm3 of the HCl I have chosen to use. 5. Then make sure you write down how much of the HCl acid used and write down your result as soon the solution becomes colourless 6. Record your results in a table 7. Repeat the titration for at least three times making sue that you use 0.1cm3 to keep the results constant. 8. Then you can workout the average for the titration. TITRATES Limewater formed (cm3) How much of the phenolphthalein used (cm3) 1st 2nd 3rd Average Bakhid Cawaale Centre no: 10266 ...read more.

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