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

Rates of reaction experiment HCl and Sodium Thiosulphate

Extracts from this document...

Introduction

´╗┐Rate of reactions The rate of reactions is how fast something changes from its reactants to its products. For a reactions to occur, the particles must strike with enough energy. At the start of the practical only some of the reactions will have enough energy to strike with each other and create energy for the reaction to happen. We can increase the rate of reaction by changing specific conditions in order to increase the rate of collision what will happen is that one of the things what can change it is the temperature because it provides the reactant with more energy. So this means the particles will be moving around more and therefore they are more likely to collide with each other. Another one is the concentration because by increasing the concentration of a reactant we are increasing the number of particles in a certain volume. This means there is more likely to be more collisions because they is more particles with in a small space. Another one could be pressure because by increasing the pressure we are decreasing the space in what the practices can move about in. so this means the practices will be more likely to collide with each other because there is less space for them to move around. ...read more.

Middle

The controlled variable was the amount of hydrochloric acid contraction must be the same. If you don?t have any controlled variables then this experiment wouldn?t have worked. Limitations My limitations could have been: Human error - I could have stopped the stop watch a second after the ?X? had disappeared, thus causing outliers in my work. The stop watch could have been faulty - the button might not have been working well and may not have stopped the timer when I pressed it. Some chemicals may have been left behind in the measuring cylinder/ test tube. Distractions - I may have been distracted by something such as a loud noise and I might have looked away at the exact moment that the X disappeared. The equipment that I used might have been contaminated if it wasn?t washed out properly the last time it was used. This could have caused a faster reaction because of any other unwanted chemicals still inside the equipment Lastly, there could have been a mistake in the measuring. This could have happened if I didn?t have the measuring cylinder at eye level when I poured in the chemicals. Methods The first thing that I did was prepare myself and the area around me for the practical. ...read more.

Conclusion

of reaction 0.4 0.009 1 0.01 2 0.01 Analysis and Evaluation By using my results it does show that as the concentration level goes up the time of reaction goes down. On my result I think we had a limitation because for the first 2 test of 2cm3 didn?t go with the rest of the results so they are ???? so I think we went wrong with that concentration. So for all the other results they matched what the scientific information said in my introduction so that show this experiment still went well even though we went wrong on them two results. The scientist said as the concentration goes up the rate of reaction will increase as well and the second table would show this but because of the 2cm3 results it doesn?t quite work out but for 1cm3 and 0.4cm3 this does go with what the scientist where saying. If I did this experiment again I would make sure that the test tubes where clean because I think we didn?t wash them out properly so it affected aware results because we did 0.4cm3 and then we did 1cm3 so I think so of the substance was still left other and it affected the 2cm3 results. This would make it better because then I think the results will show what they should show because no reactants where left other. ...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. Double Displacement Reactions

    + 2NaOH(aq) --> Ba(OH)2(s) + 2NaCl(aq) BaCl2(aq) + FeCl3(aq) --> BaCl2(aq) + FeCl3(aq) BaCl2(aq) + K2CrO4(aq) --> BaCrO4(s) + 2KCl(aq) BaCl2(aq) + Zn(NO3)2(aq) --> Ba(NO3)2(aq) + 2ZnCl(aq) BaCl2(aq) + NaBr(aq) --> BaBr2(aq) + 2NaCl(aq) 3BaCl2(aq) + 2Na3PO4(aq) --> Ba3(PO4)2(aq) + 6NaCl(aq) BaCl2(aq) + Ca(NO3)2(aq) --> Ba(NO3)2(aq) + CaCl2(aq) BaCl2(aq)

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

    down foul-water sink o Methyl orange indicator, aqueous o Risks: TOXIC if swallowed o Disposal: Dilute in water to concentration of less than 0.1%, pour down foul-water sink o Water, H2O, liquid o Risks: No risk at small volumes used/produced in experiment o Bromine, Br2, aqueous o Risks: Solutions of

  1. Investigating how concentration affects rate of reaction

    0.008 44.5 0.01 38.5 Although all of these concentrations are shown to have worked, I do not have enough time available to conduct results including each concentration. If I am going to repeat each concentration several times for more accurate results I need to investigate a smaller range of concentrations.

  2. Electrochemistry - Inventing Better Batteries

    The formula is, where V is the potential difference (voltage), R is resistance, and I is the current flowing through the resistance. The amount of current in a circuit depends on the amount of voltage available to move the electrons, and also the amount of resistance in the circuit to oppose electron flow.

  1. Free essay

    Experiment. Is the order of reaction affected if the acid is monoprotic or diprotic?

    and the hydrochloric acid would have a first order reaction. However when you simplify the chemical equations they will both be Mg + 2H+, and this tells us that they both have the same number of H+ ions and therefore the same order of reaction, which may be expected to be second order.

  2. Describe the construction, operation and application of distillation equipment used in industry

    Its production is dependant on the vapour rate of the column. Foam will decrease the efficiency of a column and increase the costs and problems associated with them. c fouling Packed columns: suffer if it contains closed packing such as Raschig rings and Pall rings.

  1. Neutralization investigation

    This will allow me to record results that will show whether the strength of an acid is accurately shown by the pH scale. Each time I have made a measurement I should wash out the burette so that any of the acid that might be left on the side of it is washed off.

  2. Individual investigation - Reaction to be studied Rate of reaction between propanone and ...

    the solution where the gradient is zero > First order: Rate must be proportional with respect to the concentration of the solution. > Second order: Rate must be proportional with respect to the (concentration)2 because the rate against the concentration is not a straight line.

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