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Investigation to find out; what happens to the rate of reaction when you change the concentration of Hydrochloric Acid, when adding it to Sodium Thio-Sulphate?

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Introduction

Investigation to find out; what happens to the rate of reaction when you change the concentration of Hydrochloric Acid, when adding it to Sodium Thio-Sulphate? PLAN I will be investigating what happens to the rate of reaction when the concentration of Hydrochloric Acid when adding it to Sodium Thiosulphate solution. I predict that as concentration of the Hydrochloric Acid gets higher the rate of reaction will be lower, this is because if the solution is more concentrated it means there are more particles of reactant in between the water molecules, which makes collisions between important particles more likely. Firstly I will draw a cross on a piece of scrap paper. I will secondly measure the water with a measuring cylinder and pour it into the bottom of the conical flask; I will then measure the Hydrochloric Acid and add that to the water. I will measure the Sodium Thiosulphate and ask a friend to start the stop watch as soon as I pour it into the conical flask because the reaction then starts. I will stop timing when the solution turns yellow and I can no longer see the cross through the solution. ...read more.

Middle

Concentration of Hydrochloric Acid - As concentration of the Hydrochloric Acid gets higher the rate of reaction will be lower, this is because if the solution is more concentrated it means there are more particles of Hydrochloric Acid in between the water molecules, which makes collisions between important particles more likely. I will control this by changing it every time. Volume of Sodium Thiosulphate - this will affect my experiment by giving the Hydrochloric Acid particles physically more Sodium Thiosulphate to react with meaning they will have more successful collisions. I will control this by not changing it so that it remains at 20 cm3. Volume of Hydrochloric Acid - this will affect my experiment by giving the Sodium Thiosulphate particles physically more Hydrochloric Acid to react with meaning they will have more successful collisions. I will control this by not changing it so that it remains at 20 cm3. I will use these measurements because it will provide a suitable range and number of results. I will use such high volumes because it will make it easier to get a more accurate time for the reaction, resulting in a more accurate graph. ...read more.

Conclusion

* Used the same measuring cylinder, but a different one for each substance as any other ones may be contaminated or cleaner. * Used the same volume of Sodium Thiosulphate every time as more will make it a different experiment. * Repeated the experiment three times to avoid any anomalous results, although I did get one. * Used the same cross as a different cross on different paper would fade at a different rate. I could have made it a fairer by: - * Completing the experiment in one session as I could have guaranteed using the same substrates. The difficulties I faced were judging when the cross had faded, measuring out the exact quantities as I used such exact volumes and making sure I didn't get confused between all three solutions as they were all clear. If I were to repeat the experiment I would use less exact measurements label each solution, this would be to avoid cross contamination of my solutions therefore making my experiment invalid. To obtain more evidence of my solution I would use more accurate measuring equipment and do more molarities of Hydrochloric Acid. ?? ?? ?? ?? Stephen Brook 11YL Chemistry Assessed Practical Page 1 of 6 ...read more.

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