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Investigate the factors that affect the rate of reaction between Hydrochloric Acid and Sodium Thiosulphate.

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Introduction

Investigate the factors that affect the rate of reaction between Hydrochloric Acid and Sodium Thiosulphate. Aim- I am going to investigate how changing the concentration of the Hydrochloric Acid affects the rate of reaction between Hydrochloric Acid and Sodium Thiosulphate. Sodium + Hydrochloric ? Sodium + Sulphur + Sulphur + Water Thiosulphate Acid Chloride Dioxide Scientific Variables. Temperature- Increasing the temperature of a solution causes particles to move faster, with more energy. The particles will collide more often and with greater energy. This will mean more successful collisions per second and so a faster rate of reaction. Catalyst- By using a catalyst the particles will only require moderate energy to collide and react. This means more successful collisions are likely within the same amount of time. More collisions create a faster reaction. Concentration- Increasing the concentration of a reactant simply means there are more particles in the volume of a solution. Therefore there are more particles, which can collide and so react. More collisions mean a faster reaction. Fair test- To ensure that the investigation is a fair test the only thing that should be changed is the variable being investigated, in this case the concentration of the Hydrochloric Acid. The volumes of each chemical should be the same for each attempt, the conical flask should be made from the same material each time. ...read more.

Middle

Results. Concentration of Hydrochloric Acid mol dm(( Time 1 Taken / 2 Seconds 3 Average 2.00 28.44 26.11 27.64 27.46 1.50 28.07 29.56 32.04 29.99 1.00 33.42 33.51 30.15 32.36 0.75 34.77 35.00 35.99 35.25 0.50 43.88 44.80 45.54 44.74 Analysis. The line of best fit on the attached line graph shows us that as the concentration of the hydrochloric acid is increased the time the reaction takes decreases. This matches with my prediction. Increasing the concentration of the hydrochloric acid means there are more particles within the same volume. This leads to more particles being able to collide, break bonds and so react. With more successful collisions taking place, the reaction time was reduced The result table shows that the fastest reaction time was 26.11 seconds when using a concentration of 2.00 mol acid. The slowest reaction time was 45.54 seconds, when using a concentration of 0.50 mol acid. This tells us that the reaction time was speeded up by 19.43 seconds when using 2.00 mol hydrochloric acid instead of 0.5 mol. The line of best fit does not show any major anomalies in the results. In conclusion, changing the concentration of hydrochloric acid will change the rate of reaction. The higher the concentration, the quicker the reaction will be. Evaluation. Results have demonstrated that a change in the concentration of Hydrochloric Acid does directly affect the rate of the reaction time. ...read more.

Conclusion

A catalyst is a substance that increases the rate of reaction without being used up. By lowering the amount of energy needed and providing a surface for the reacting molecules to attach to, the chance of the molecules bumping into each other is greater. However to investigate Sodium Thiosulphate and hydrochloric acid without the influence of a catalyst, the affect of temperature on the rate of reaction could be investigated. The concentration of Hydrochloric Acid used will remain the same throughout the experiment to ensure a fair test but the temperature at which the reactants come together could be altered gradually. A beaker of water could be heated on top of a tripod and gauze over a Bunsen burner and the temperature tested using a thermometer. When the water reaches the desired temperature, the beaker could be removed and the Sodium Thiosulphate and Hydrochloric Acid added to a flask and immediately place over the flame. The cross method could be used again placed on top of the gauze, under the flask. This could be carried out at a number of different temperatures. This would be a good experiment, as the reactant times would highlight whether concentration or temperature has a greater affect. A range of temperatures could be used with 2.00 mol dm, 1.00 mol dm and 0.5 mol dm to also see how heat affect varies with the different concentrations. The Sodium Thiosulpahte and Hydrochloric Acid could also be added together at room temperature with no heat as a control. ...read more.

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