Prediction:
I think that the higher concentration used for the experiment the quicker the reaction will finish.
I think this as if there was higher concentration of sodium thiosulphate then there is more sodium thiosulphate particle present to react with hydrochloric acid particles and collide into each other more (The collision theory). The collision theory basically is: Rate of Reaction depends on how often and hard the reacting particles collide with each other.
Temperature also affects rate of reaction when temperature s increased the particles move faster there for more they collide with more energy speeding up the rate of reaction.
Rate of reaction may speed up if there is a smaller surface area so if we was using solids if we crushed it up into powered it would speed up the reaction.
I will make it a fair test by:
- Keeping the same burette through out my investigation
- I will wash out my conical flask thoroughly with water after each set of readings
- I will use the same amount of sodium thiosulphate and hydrochloric acid for each reading
Results:
I worked out the average by adding up the three totals and dividing it by the amount of totals I got.
I worked out the rate of reaction by dividing 1 by the average number .
My results show that when the concentration increases the rate of reaction increases I think this happened because there was higher concentration of sodium thiosulphate then there is more sodium thiosulphate particle present to react with hydrochloric acid particles and collide into each other more (The collision theory). The collision theory basically is: Rate of Reaction depends on how often and hard the reacting particles collide with each other.
My graph shows positive correlation. I noticed when the I increased the concentration the speed of which the reaction finishes is quicker I think this happened because of there more sodium thiosulphate atoms in the mixture
Evaluation
To make my results accurate I repeated the experiment and worked out an average of my results this way if I got any anomalies I would be able to identify them quite easily.
If I could change how I did the experiment I would have you change how the acid was added. I would still used the burette to measure the acid cause it gives a very accurate measurement. But I would have put it in mass from the burette. I would change this way cause when I used a higher concentration of sodium thiosulphate the reaction had already started this might affected the results
To follow up my investigate in would find out how surface area would affect rate of reaction I would do this by using marble Chips and marble powder in acid and would time how long the reaction took to finish and worked out the difference
