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Aim: To determine the concentration of a Limewater solution

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Introduction

Chemistry Coursework Aim: To determine the concentration of a Limewater solution Titration is used to analyse solutions and to investigate reactions. Titrations are common because they are quick, convenient, accurate and easy to automate. A titration only gives accurate results if the reaction is rapid and is exactly described by the chemical reaction. The analyst adds a measured volume of one solution to a flask with a pipette, and then adds the standard solution from a burette. The end point is by adding a few drops of indicator. Apparatus, Equipment and chemicals that I will need are as follows: Pipette 25 cm Burette Conical flask 250cm Volumetric Flask 500cm While Tile Clamp and stand Indicator (methyl Orange) Limewater Hydrochloric acid Distilled Water Funnel How much should I dilute my Acid down? Balanced Equation is Ca(OH) 2 + 2HCL ==> 2H2O + CACL2 1g dm3 = 1/74 = 0.0135moldm3 To check 40+(16+1) ...read more.

Middle

Before I can continue with the experiment I must dilute my acid. To insure that I dilute it precisely I must use a volumetric flak and pipette. I measure out 475cm3 of Distilled water and place it into the volumetric Flask then pipette 25cm3 of hydrochloric acid and pour it into the volumetric flask to make up the difference. I will also perform the experiment several times so I know that my results are dependable. Diagram 1. Using the funnel, rinse the diluted acid into a burette. 2. Using the pipette filler, rinse the pipette with 25cm3 of Limewater solution. Place into the conical flask, place under burette on a white tile. 3. Add a few drops of indicator 2-4 (Methyl Orange) 4. Run Hydrochloric from the burette into the Limewater in the conical flask. With swirling until it turns a neutral colour. 5. Refill the burette with hydrochloric acid and again record the initial burette-reading make a note of the volume of acid used. ...read more.

Conclusion

I needed a 500cm volumetric flask to do my experiment but there were only 250cm volumetric flask left. So I used the 250cm one, so that meant that I added 237.5 cm of distilled water and made up the difference with the hydrochloric by 12.5 cm. At the end of the experiment there was still some diluted acid left so maybe I should have diluted it by 100 instead of 250. I feel that I should have stopped titration as soon as I saw climes of the neutral colour as I waited for it to turn the full colour. If I had to do this experiment again I would prepare about four conical flask to reduce time because each time I did titration I had to stop and wash the conical flask with distilled water so there wasn't any traces of Limewater in the conical flask. I would also use a ph meter so it would be more accurate. Nilam Nakarja 12C2 - 1 - ...read more.

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