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How how the concentration of a solution affects the rate of reaction

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Introduction

Aim I am investigating how the concentration of a solution affects the rate of reaction. Possible Input Variables * Temperature * Concentration * Surface area * Stirring Possible outcome variables * Colour Change * Any gases given off My input variable will be: - Concentration My outcome variable will be: - Colour Change My Control Variables will be: - * Volume of acid * Volume of thio * Shape of reacting vessel * Temperature Prediction The more concentrated the Thio-sulphate solution the least time it takes to react. ...read more.

Middle

Always make sure that the glass wear is clean. 3. Place the beaker with 50cm3 of thio sulphate on top of the paper. 4. Add 5cm3 of acid into the solution. 5. Put your head over the beaker so you can see clearly when the 'x' disappears. 6. Time how long it takes for the 'x' to disappears. 7. Range - 50 thio/ 0 acid - 45 water/ 5 acid Results Thio Sulphate solution (cm3) Water (cm3) Time taken (secs) Average 50 0 58 53 55.5 45 5 61 69 65 40 10 77 79 78 35 15 87 89 88 30 20 94 94 94 25 25 ...read more.

Conclusion

I know this because when there is 45cm3 of thio solution and only 5 cm3 of water it only takes 65 seconds for the cross to disappear whereas when there is 5cm3 of thio solution and 45cm3 of water it take 691 seconds for the cross to disappear. Evaluation. I am confident with my results as I made the experiment a fair test by making sure that the glass wear was washed clean after every experiment. Another reason I am confident is because I done the experiment twice and made an average. If I could do the experiment again then I would maybe repeat it one more time to make my results more dependant. Science (Chemistry) Alexandra Heggie A:/sciencecoursework ...read more.

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