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To determine the concentration of a limewater solution.

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Introduction

To determine the concentration of a limewater solution By doing this experiment I aim to find out the concentration of 250cm3 of limewater in g dm3 as accurately as possible that is given to me with approximately 1g dm-3 of calcium hydroxide dissolved in it. I have to design my own plan to work out the concentration of this limewater solution, I will choose a list of equipment and apparatus that is needed for me to carry out this experiment. Available to me is indicators and hydrochloric acid which has the concentration of exactly 2.00mol dm-3. The hydrochloric acid is much too concentrated so it will have to be diluted. I will use the following apparatus, equipment and chemicals- * Pipette * Measuring cylinder (100ml, 500ml) * Conical flask 250cm3 * Volumetric flask 500cm3 * Burette * Clamp stand * White tile * Indicators (methyl orange) * Distilled water * Hydrochloric acid (concentration 2.00 mol dm3) * Limewater (250cm3 with 1g dm3 of calcium hydroxide dissolved in it) When slacked lime is dissolved in water it is called limewater and Quicklime + water = slacked lime CaO(s) ...read more.

Middle

* Then I will add 475 cm3 of distilled water in the same volumetric flask. I will measure the distilled water by filling the volumetric flask to the graduated mark on the volumetric flask which is the 500cm3 mark. This would give me 475 cm3 of distilled water. * Then I will invert the volumetric flask a few times so that the solution is mixed well. * I will then set up my apparatus which is shown in the diagram. * I will add 25cm3 of limewater to the conical flask using a measuring cylinder. * Then I will add 5 drops of methyl orange indicator to the limewater so that I can see when the neutralisation point is obtained. The solution will turn light orange and should turn pink/red by the end of the titration. * I will then wash out the burette with HCl to make sure it isn't contaminated which would affect the results. * Then I will fill the burette with the diluted HCl and note the amount of HCl in the burette. ...read more.

Conclusion

is much higher up the pH scale, because of this, if I use phenolphthalein then the colour change would be reached before the chemicals acid bases breaks up. 3 To be safe when doing the experiment I will use eye protection because I will be working with acid. I will also be very careful when handling the chemicals because they are corrosive. To find out the concentration of the limewater solution- I will take the average titration which is the 3 titrations added up and divided by 3. Then I will work out the number of moles of HCl used- 1dm3 = 1000cm3 Number of moles = concentration � volume 0.1/1000 � average titration = number of moles of HCl used Number of moles of Ca(OH)2 Reaction ratio = 1 Ca(OH)2 : 2 HCl (Number of moles of HCl used) � 2 = Number of moles of calcium hydroxide Concentration of limewater: dm3 25.0 cm3/1000 = 0.025 dm3 (No of moles of calcium hydroxide) � 0.025 = concentration of limewater (mol dm3) Concentration of limewater in g dm3 Formula mass Ca(OH)2 = 40.1 + (16+1) � 2 = 74.1g Concentration of Ca(OH)2 in g dm3 =74. ...read more.

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