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The aim of this experiment is to determine the concentration of a limewater solution by method of titration.

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Introduction

Assessed Practical To determine the concentration of a limewater solution. Aim: The aim of this experiment is to determine the concentration of a limewater solution by method of titration. Ca(OH)2 (aq) + 2HCl (aq) CaCl2 (aq) + 2H2O (l) The calculation below is to determine the dilution factor and the volume of HCl needed for this titration. Moles of Ca(OH)2 = Mass / Mr 1 / 40.1 + (16 x 2) + (1 x 2) 1 / 74 0.013513513 moles Concentration of Ca(OH)2 = N / V 0.01 / 1 0.01 moldm -3 Moles = C x V 0.013513513 x (25/1000) 0.0003378moles Ratio: HCl : Ca(OH)2 2 : 1 0.000676 : 0.0003378 Moles of HCl = moles of Ca(OH)2 x 2 V = N / C 0.00674 / 2 ...read more.

Middle

* 250cm3 conical flask * distilled water * 25cm3 pipette To dilute the Hydrochloric acid- 1. Pour 2.5cm3 of HCl into a volumetric flask using a 5cm3 graduated pipette. 2. .Fill up to the marked like on the 250cm3 volumetric flask with distilled water. 3. This has diluted the 2mol dm -3 HCl to 0.02mol dm -3 . Titration: 1. Firstly the burette should be placed securely in the stand, 10 cm above the surface of the table. 2. Fill the burette with 50cm� of HCl, using a funnel to prevent spillage of the acid. Record the initial volume in a results table. 3. Pipette 25cm� of limewater into a 250cm� conical flask. ...read more.

Conclusion

Record the final volume of HCl in the results table. Then calculate the titres by minusing the final volume from the initial volume. 7. Dispose of the contents in the conical flask; rinse the conical flask with distilled water. Add 25cm� of limewater and five drops of methyl orange. Place the conical flask underneath the burette. 8. Repeat steps 5, 6 and 7 until you have three titres that are all within 0.1cm� of each other. This means that the results obtained are concordant to each other. Safety, Hazards and Preventions: Chemical Name Hazard Precaution Hydrochloric acid (2mol dm -3) Irritant Wear safety goggles and a Lab coat. Calcium Hydroxide (1g dm -3) Minimal Hazard Wear safety goggles Indicator: Methyl orange Skin Contaminant Use a pipette to avoid skin contact. ...read more.

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