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An investigation to examine the chemical reactionsbetween

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Introduction

An investigation to examine the chemical reactions between Sodium thiosulphate and Hydrochloric acid. Results Table 1: Concentration of Na2 S2 O3. (Molar) Starting Temperature. (Degrees Celsius) Time taken for solution to turn cloudy. (Secs) Average time taken. (Secs) Exp 1 Exp2 0.5 20 509 491 500 1.0 20 174 182 178 1.5 20 116 108 112 2.0 20 80 74 77 2.5 20 74 77 75.5 3.0 20 65 64 64.5 The above results table shows the time taken for the cross to disappear from under the conical flask. (Not visible to the naked eye) Results Table 2: This results table shows the time taken for the actual molecules to collide with one another and react. Concentration of Na2 S2 O3. (Molar). 1 x 10 000 average time (Secs ) 0.5 20 1.0 56 1.5 89 2.0 130 2.5 132 3.0 155 An investigation to examine the chemical reactions between Sodium thiosulphate and Hydrochloric acid. Introduction Hypothesis: 3.0m of Na2 S2 O3 will react faster than the 0.5m of Na2 S2 O3 with the hydrochloric acid I am carrying out an investigation to distinguish how long it takes for different strengths of Sodium thiosulphate (reactant 1) to react with an invariable strength of hydrochloric acid (reactant 2). Prediction: I predict that the higher the concentration of Sodium thiosulphate added to the hydrochloric acid will result in the solution turning cloudier, quicker. (The quicker the chemical reaction takes place) Where as O.5m Sodium thiosulphate will take much longer to react because it isn't very reactive, unlike the 3.0m, which will be the highest strength of the sodium thiosulphate I will use. ...read more.

Middle

I will then stop the stopwatch only when the cross is no longer visible to the naked eye. I will then repeat the exact same experiment for the other strengths of the sodium thiosulphate. After doing so, I will once again repeat the whole experiment (twice in total) to help get the most accurate results possible. In my investigation I will use a mixture of independent variables and dependent variables. The independent variable I will use is the concentration used of sodium thiosulphate and the dependent variable I will use is the time taken for the cross to disappear. An investigation to examine the chemical reactions between Sodium thiosulphate and Hydrochloric acid. Preliminary Work: Before I do the actual investigation I will under go some preliminary work, this will help me to decide what reasonable range of strengths I could use for the Sodium thiosulphate in the real experiment. I decided to begin my range with 0.5m and end with 3.0. I decided that this range will be sufficient because the six different strengths (each interval 0.5m) would give me a clear idea to help me come to a firm conclusion and state whether my original hypothesis and prediction were correct or false. I also did an experiment with the 0.5m and 3.0m of sodium thiosulphate. Mini plan Initially I will fill a measuring cylinder up to 25ml with 1.0m of hydrochloric acid. (I will measure all the strengths of sodium thiosulphate and the single strength of hydrochloric acid to 25ml in both experiments to ensure a fair test) ...read more.

Conclusion

This may be because I may not have carried out the experiment as accurately as possible. In the future I will try and act upon this. If I had to repeat this experiment once more in the future I would do countless things to ensure I get the best and most reliable results possible, and they are the following: * I could use a more accurate thermometer, which will give me a more accurate reading of the start temperature of the Hydrochloric acid. * When the sodium thiosulphate is added to the hydrochloric acid I could cover the conical flask with sugar paper, which will not allow any change of the atmosphere inside the conical flask, which will ensure a fair test. Another way in which I could improve my results is by doing the whole investigation differently. I could pour the hydrochloric acid and sodium thiosulphate into a boiling tube and clamp the boiling tube onto a tower of some sort and place a light source directly under the boiling tube, preferably a light bulb. I could then place a light censor above the boiling tube and connect it to a computer so when the light from the light source reaches a certain level at the censor then the computer will stop timing. This method would be very effective and would allow me to get very accurate results. I can once again finally conclude that the higher the concentration of sodium thiosulphate added to the hydrochloric acid, the quicker the chemical reaction takes place and the solution becomes cloudier. Hussain Ali 11PT Science Coursework ...read more.

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