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Preparing a solution of sodium Chloride

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Introduction

Portfolio Evidence - (Lukas Chamberlain) Activity 1.2 & 1.2a: Preparing a solution of sodium Chloride Contents 1. Introduction: Type of chemical analysis to be carried out 2. Safety points 3. Materials and methods 4. Results 5. Evaluation 6. Discussion of vocational implications Portfolio Evidence - (Lukas Chamberlain) Activity 1.2 & 1.2a: Preparing a solution of sodium Chloride Introduction One of the most common practices in the laboratory is accurately to prepare chemical solutions in the laboratory. I was given the task to prepare a one mole solution of sodium chloride for a precipitate experiment. The solution must be at a high level of accuracy to make sure the experiment works next week. Safety Points Sodium Chloride * Wear safety goggles * Do not eat * Use smallest amounts possible on a watch glass to prevent contamination of the bottle * Test for sodium last as the nichrome wire is difficult to clean afterwards * Wear suitable protective clothing If splashed in eyes: In case of contact with eyes, rinse immediately with cold water and seek medical advice If ...read more.

Middle

I then took some bodies opinion on whether or not the water was at the right level. I found the weight of 14.6 grams by adding the relative atomic masses of the two elements together to find the amount needed to make a one mole solution of sodium chloride if mixed with one litre of water. But I only need 250 ml or 250 cm� of water so I divided the weight by 4: Na and Cl 23 and 35.5 58.5 58.5 / 4 14.625 grams of sodium chloride Results When I viewed the solution I found that the solution was saturated at the beginning of the preparation. So I added a little more water and stirred it for a longer time until the solution became transparent. There were no other problems that I could observe. Therefore it should be a one mole solution of sodium chloride Evaluation Difficulties I had to make sure that I ripped the weight of the filter paper when weighing my sodium chloride. ...read more.

Conclusion

There may also be sodium chloride left in the filter paper. How it could be enhanced The next time I could use more accurate scales so I used the right amount of sodium chloride. I would also wash and rinse the equipment more time to make sure it was cleaner and more of the sodium chloride was in the solution. Vocational implications Sodium chloride as a preservative Sodium chloride is used to store foods in such as carrots and potatoes in a tin to keep them from going off. They have machines that add salt to the water so they don't use the same technique. There is also hardly any safety procedures as they are not mad by man. The accuracy is less to use for a preservative as it is not essential that it is a one mole solution for an experiment. It is also made on a larger scale as more is needed and accuracy is not needed. ?? ?? ?? ?? Chemistry ? Preparing a chemical solution Lukas Chamberlain Page 1 02/05/2007 ...read more.

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