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Investigating the rate of reaction between sodium thiosulphate and hydrochloric acid.

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Introduction

Investigating how the concentration of sodium thiosulphate affects the rate of reaction This coursework will be investigating how the concentration of sodium thiosulphate affects the rate of reaction when mixed with hydrochloric acid. In order to carry out this investigation, different experiments will be carried out. The rate of reaction can be seen as the rate of loss of one or both of the reactants or the rate of a new chemical product being developed as a result of the chemical reaction. The main reason for the experiments is to see if the prediction proves to be accurate and to record how long it takes sodium thiosulphate and hydrochloric acid to react together by using different concentrations of sodium thiosulphate ( Na2S2O3) in each experiment. An indication of a successful reaction is when the colourless liquid goes cloudy and the x that the beaker was on top of is no longer visible. The word equation for the reaction between sodium thiosulphate and hydrochloric acid is: + + + + The symbol equation for the reaction between sodium thiosulphate and hydrochloric acid is: + + + + The factors that will be controlled are making sure that the amount of HCL in each experiment stays the same and also making sure the volume of all the reactants in each experiment stays the same. ...read more.

Middle

For example a 5g of calcium carbonate as fine powder will have a greater combined surface area than a 5g chunk of calcium carbonate. This is evident in simple things like chewing your food as this process breaks down the food into smaller pieces which will increase the surface area so the digestion of that food will be faster. Concentration Concentration will affect the rate of reaction as by increasing the concentration of sodium thiosulphate it will increase the amount of times that it collides with the particles of the hydrochloric acid solution. Also if we take into account that when the two particles collide, it is not all the time that they will have enough energy to start a reaction as each of the molecules will have different energy levels. An increase in the concentration will increase the amount of collisions there are and will affect the amount of colliding molecules that do have sufficient energy levels to react together. Catalysts Catalysts will affect the rate of reaction as it will speed up the reaction by either lowering the activation energy required to start a successful reaction when the hydrochloric and sodium thiosulphate particles collide or making the conditions right for a chemical reaction to take place to take place or both. ...read more.

Conclusion

To indicate a successful reaction and when we stopped the experiment was when the cross underneath the beaker was no longer visible so we made sure that by keeping the colour, size and shape of the cross exactly the same so that it would not affect our results. And as we used a stopwatch, we made sure that the person that was holding the stopwatch started the time as soon as both of the chemicals was added to the solution of hydrochloric acid in the beaker and also we made sure that they was the one that stopped the clock when they could no longer see the cross because if it were another person that was looking at the solution until they could no longer see the cross and then had to relay that to the person as in telling them when to stop, this would have wasted time and affected our results as the time it took the cross to disappear might be increased by a significant amount which would be due to human error. Results Volume of s.t/cm3 Volume of distilled H20 added/cm3 Concentration of mole /dm-3 Volume of hydrochloric acid added/cm3 Results/Time taken 50 0 0.15 40 10 0.12 30 20 0.09 20 30 0.03 10 40 0.01 Various sites and textbooks were used which provided the information I needed. ?? ?? ?? ?? Science coursework Lopez Okhiai - 1 - ...read more.

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