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Investigation to find the reaction rate between Hydrochloric Acid and Variable concentrations of Sodium Thiosulphate.

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Introduction

Investigation to find the reaction rate between Hydrochloric Acid and Variable concentrations of Sodium Thiosulphate Planning Equipment * * Pestle and Mortar * Hydrochloric Acid * Sodium Thiosulphate * Distilled water * 10ml measuring cylinder * 100ml measuring cylinder * Target card * Stopwatch * Pipette * Conical flask * Distilled Water * Electrical scales * Plastic dish Method To start I will measure out 50ml of distilled water out in the 100ml measuring cylinder. I will then pour this into the pestle and add 1 gram of Sodium Thiosulphate and use the mortar to mix and dissolve it. I'll then measure out 10ml of Hydrochloric Acid in the 10ml measuring cylinder. To make this precise I'll use a pipette to transfer the Acid rather than pouring it from the bottle. I'll place the conical flask centrally on the target card and pour in the Sodium Thiosulphate solution into it. ...read more.

Middle

To measure the Sodium Thiosulphate I'll use electrical scales, and remember to zero them with the plastic dish on first before I start adding the Sodium Thiosulphate. We did a preliminary experiment using the same method, and saw the reaction time decrease as the concentration increased. In this experiment I'll be making five measurements one for each different weight of Sodium Thiosulphate I'm using. I'll repeat the whole experiment once to give my self more reliable results. Prediction I predict that as we increase the concentration of Sodium Thiosulphate in the water, the reaction time will decrease, getting faster and faster. This is based upon my theory that when Sodium Thiosulphate and Hydrochloric Acid are mixed a reaction takes place, this must be true because if it were not then this experiment would be pointless, and that the more of one or the other will increase the reaction, I based this upon my observations that the more wood or gas the is the quicker the fire burns, hence a faster reaction. ...read more.

Conclusion

Evaluation There were only a few problems in the experiment that we encountered. The first of which was the sensitivity of the scales this made it hard to precisely get the weight required, this was acquired over time though and didn't serve too much of a difficulty. The results were moderately accurate in relation to the method and equipment we were using. The only odd result we obtained was the finding for 1 gram of Sodium Thiosulphate. This was because the 2 gram made too much difference in the reaction rate compared to 1 gram which was not powerful enough to give the reaction the speed to take place quickly. If I were to repeat the experiment I would take a few measurements between the 1 gram and 2 gram markers, to make the results more accurate. When pouring the liquids the use of a funnel may have eased the process. But the overall experiment was a success and worked fine. Jamie Willis ...read more.

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