• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Science Investigation: HCL & Sodium Thiosulphate

Extracts from this document...

Introduction

Investigating the rate of reaction between Sodium thiosulphate and Hydrochloric acid Aim I am going to investigate how changing the concentration of sodium thiosulphate affects the rate of reaction with Hydrochloric Acid. I am going to time how many seconds it takes until you can no longer see the black cross on a piece of paper under the beaker. Each time I do the experiment, I will change the amount of sodium thiosulphate and water in the reaction mixture. I want to find out if the concentrated sodium thiosulphate makes the reaction faster or not. When sodium thiosulphate and hydrochloric acid are mixed, a yellow precept of sulphur is produced. The solution becomes increasingly difficult to see through as more and more sulphur is formed. We can measure how fast this reaction occurs by drawing a cross and placing the reacting mixture over it in a clear conical flask. We then observe the time it takes for the cross to disappear (due to the formation of sulphur turning the mixture cloudy) to get an approximate reaction time. Equation Preliminary Results In the preliminary I worked out to make it a fair test I would place a black cross underneath the experiment. To no when to the solutions has become completely cloudy and the reaction has reached the point I am measuring to. Volume of sodium thiosulphate (ml) ...read more.

Middle

I will also make sure that the timer is started and stopped at the same point of the experiment and solutions will be made as accurate as possible to ensure that tests correlate with each other better. Safety Throughout this experiment, many risks may arise. I will make sure I wear safety glasses at all times to minimise the risk of chemicals entering my eyes and damaging them. I will also make sure that I know how and when to alert my teacher if a problem does occur, such as broken glassware or chemical if it spills. I will also use a heat mat so that the heat will not be damaged if there is a chemical spillage. Method 1. Measure 50mlof Sodium thiosulphate and 10ml Hydrochloric acid and pour them into separate beakers, making sure you take note of which chemical is which as both are colourless 2. Place the conical flask onto the black cross so that you can see it through the base of the flask. Set up the timer and pour the two chemicals into the conical flask. Start the timer immediately. 3. Keep an eye on the black cross through the top of the conical flask. When you can no longer see the cross through the solution, stop the timer. 4. Record the results and repeat with other concentrations of Sodium thiosulphate. ...read more.

Conclusion

There were a few outlier results, which could be a bit closer to the line of best fit, though they were not too bad (e.g. 35% concentration for the reaction rate graph.) My first sets of results for the 50% concentration were too high compared to my other results, so I had to them again. It later reminded to me that I had done the test at a different time of day to the other results, so I had a different temperature. This would have affected my results, so the new results were done at roughly the same time of day, and therefore same temperature. I also made a mistake in calculating the reaction rates of the sulphur the product which was made in the reaction as I mistyped the result into my calculator and got a completely outlier result. This was put right as soon as I noticed the error. The temperature may affect the results and make them faster or slower depending on the temperature the chemicals are stored at and the room temperature and finally, I believe that my investigation has proved that concentration has an affect on the results as well. Using a measuring meant that my solutions were not as accurate as they could have been, e.g. when calculating 5ml volume in my preliminary results, the 10ml cylinder would have an error of 0.1ml one way or another, calculating as 20% difference, as seen in the formula below: % Error = 0.1 x100 5.0 ?? ?? ?? ?? ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Physical Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Physical Chemistry essays

  1. The Determination of rate equation

    Repeat the experiment with the same amount of HCl, Na2S2O3 and H2O another 2 times and record the result to make the experiment reliable and the data collected valid. 34. Now repeat the whole experiment using different ranges shown bellow: During these stages distilled water will be used to dilute

  2. detremining the rate equation

    * test tubes * stirring rod- to stir the reactants ones the are added together * stopwatch- this will be used to time how long it takes for the black cross to despappear. * 1M sodium thiosulphate * HCl- 2.0 moldm-3 * Na2S2O3 0.4 moldm-3 * Distilled Water * 3

  1. Investigating the Rate of the Reaction between Bromide and Bromate Ions in Acid Solution

    Hence I will make up a solution of 0.01M phenol and dilute this to make a solution of 0.0001M phenol. I will make up 100cm3 of each of the catalyst solutions (solutions of transition metal ions), since I will only require a few drops at a time of each of

  2. Investigating how concentration affects rate of reaction

    Figure 4 shows the change when the temperature is increased by 10K. It shows that there is still a wide range of energies but now there are more particles with a higher kinetic energy. At the higher temperature of 310 Kelvin there are many more molecules which have reached the activation enthalpy level than at 300K.

  1. Magnesium and hydrochloric acid react together readily. Plan and carry out an investigation testing ...

    In a gas, increasing the pressure (concentration). Means that the molecules will be more compact so there will be more collisions as a result. Low Concentration High Concentration Surface area of solid reactants If any one of the reactants used in the investigation is a solid then breaking it up into smaller pieces will increase its surface area.

  2. This investigation is an investigation to find the concentration of two unknown solutions, Na0H ...

    This could mean that chemicals present in the burette or conical flask may have caused the Sodium Hydroxide using a smaller amount of Hydrochloric acid. During the titration, measuring accuracy of the equipment have to be taken into account. The pipette has an accuracy of ±0.06cm3 meaning the accuracy of the equipment is pretty good.

  1. AQA As Applied Science Unit 3. Colorimetry experiment on Ribena juices

    I will call for help and then rinse under cold water, if the pain is to go on then I will seek first aid medical attention as it could become an infection due to the other chemicals being used. If I see any broken glass I will clean up using

  2. Rates of reaction experiment HCl and Sodium Thiosulphate

    So if we change the concentration of the experiment we are increasing the number of practices inside the reactions. Hypothesis Based on the information?s what I put about the rate of reaction I think as the concentration increase the rate of reactions will increase as well because they will be

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work