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

Disappearing cross experiment

Extracts from this document...


Disappearing cross experiment Temperature affecting the reaction rate Introduction In this experiment reaction rate between hydrochloric acid (HCl(l)) and sodium thiosulphate (Na2S2O3) will be examined. The reaction is: HCl(l)+ Na2S2O3(l) = H20(l) + + The purpose of the experiment is to determine whether or not increasing temperature will increase the rate of the reaction. Reaction rate is a way of measuring how fast the reaction takes place. So the higher the reaction rate the faster the reaction takes place and the lower is the reaction time is. Research Question How does reaction rate change with increasing temperature of sodium thiosulphate in a reaction between hydrochloric acid (HCl(l)) and sodium thiosulphate (Na2S2O3(l)) ? Hypothesis With increasing temperature of sodium thiosulphate the reaction rate will increase as well. Justification As the collision theory states for a chemical reaction to occur particles need to collide at a certain speed and angle. Increasing the temperature gives particles more energy, so they move faster. As they move faster more collisions happen, hence more successful collision, which increases the rate of the reaction1. Materials > Hydrochloric acid HCl(l) > Sodium triosulphate Na2S2O3(l) > 250 ml3 beaker > 50 ml3 conical flask > 2 x 25 ml3 measuring cylinder > Thermometer > Stop clock > Tea kettle > Blank card > Pen Variables Reaction time is the dependent variable, as it depends on the temperature of the solution. ...read more.


If the flask was taken out when the thermometer showed 22�C it would have increased a little bit so that the temperature would not have been 22�C. * The flaks was then quickly put on the cross card Now the reaction is ready to take place 2. The acid was now poured quickly into the flask and the added with sodium thiosulphate 3. As soon as the acid was in the flask the swirling of the flask and the stop clock were started 4. When the cross, under the flask, could no longer be seen through the liquid the stop clock was stopped 5. The equipment was then washed off and the same experiment took place with 4 other temperatures (32�C, 42�C, 52�C, 62�C), adding up to 5 temperatures in all. 6. The 5 experiment were then repeated, to see whether those results are in accordance with the first five results. This helps reducing the possible errors. The 5 experiments should give a clear answer to the research question: "How does reaction rate change with increasing temperature of sodium thiosulphate in a reaction between hydrochloric acid (HCl(l)) and sodium thiosulphate (Na2S2O3(l)) ?", as for each experiment the temperature of the sodium thiosulphate is increased by 10�C. ...read more.


Inaccuracies and Possible improvements Temperature is the only independent variable, so all other measurements and actions have to stay constant throughout the 5 experiments. These measurements and actions are: > The exact amount of hydrochloric acid and sodium thiosulphate > The time it took from when the wanted temperature was reached till the reaction took place (as the temperature slowly decreases in the time period) > The time it took before the swirling took place after the reaction took place and how quick the flask was swirled > How quick the stop clock was started and stopped after the reaction took place and the cross disappeared, respectively. And also the difference in temperatures from one experiment to the next one had to stay the same. (Example: experiment 1: 22�C, experiment 2: 32�C, experiment 3: 42�C. So 42-32=32-22) As all these could not possibly have stayed constant throughout the experiment these are the inaccuracies that could have caused the results not to be as exact as possible. As explained before the experiment was conducted without any noticeable errors so the only improvement, that could take place next time this experiment is conducted, is the one that concentrates on more precision of the above mentioned inaccuracies. 1 Neuss, Geoff. Chemistry for the IB Diploma, 2001 ?? ?? ?? ?? ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate 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 International Baccalaureate Chemistry essays

  1. Rate of Reaction sodium thiosulphate

    if a concentration of 0.2M should be attained, then the measuring cylinder should measure 0.2ml of sulphuric acid and 0.8ml of distilled water is then added). If 10ml of acid is present then no water should be added. For this experiment every interval of 0.2M concentrations of sulphuric acid are measured.

  2. Aim: To study and investigate the effect of temperature on the rate of ...

    The equation for the reaction is given below: Na2S2O3(aq) + 2HCl(aq) ? 2NaCl(aq) + SO2(aq) + H2O(l) + S(s) This equation can also be represented in the ionic-equation form in the following manner: S2O32- + 2H+ ? H2O + SO2 + S Looking at the results obtained, it is interesting

  1. IB chemistry revision notes

    * * A Voltaic Cell * A Voltaic half-cell is a metal in contact with an aqueous solution of it's own ions. * A Voltaic cell consists of two different half-cells, connected together by an external wire and a salt bridge (damp filter paper soaked in).

  2. The rate of reaction between sodium thiosulfate and hydrochloric acid

    Wash out the flask thoroughly. 9. Repeat the experiment using other volumes of sodium thiosulfate and water in the table next page. Volume of sodium thiosulfate 0.10 M (� 0.0500 ml) Volume of water (� 0.0500 ml) Volume of hydrochloric acid (� 0.0500 ml)

  1. What is the rate equation of the reaction between sodium thiosulphate and hydrochloric acid?

    - The time it took for the X drawn on the piece of paper and placed under the Erlenmeyer flask to be obscured was shorter with higher concentrations if each reactant.

  2. titration experiment

    certain amount of NaOH Sample number Volume of HCl �0.00055 L Number of moles in HCl �0.00004 mol Number of moles in NaOH �0.0004 mol Concentration of NaOH �0.00134 L/mol 1 0.0311 0.00292 0.00292 0.09733 2 0.0308 0.00295 0.00295 0.09833 3 0.0319 0.00300 0.00300 0.10000 Average 0.0313 0.00296 0.00296 0.09856

  1. The aim of this experiment is to examine the enthalpy of combustion of the ...

    For example Ethanol has the formula C2H5 OH. The walues of each bonds are presented bellow, and by just looking at them and thinking about the chain lenght of ethanol,methanol,propanol,butanol and pentanol respectively, it can be concluded that pentanol will have the longest chain, therefore the strongest one and so

  2. Reaction Rate

    Total volume of H2SO4 solution per trial (mL) Mass of Mg ribbons added to reaction each trial (g) Amount of Hydrogen gas produced per trial (mL) 0.5 10 0.05 20 Average time taken by reaction to produce 20mL of H2 gas =T1+T2+T3 3 1 10 0.05 20 1.5 10 0.05 20 2 10 0.05 20 Method: 1.

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