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

The Effect of Reactant Concentration on the Rate of a Chemical Reaction

Extracts from this document...

Introduction

The Effect of Reactant Concentration on the Rate of a Chemical Reaction By Shazan Pestonji, Chun Kit Lam & Jonathan Ng Objective: To investigate how changes in the concentration of a reactand affects the rate of a particular chemical reaction. Hypothesis: The greater the concentration of the reactants the faster the rate of chemical reaction will occur, where as solutions which are diluted with other substances will require a longer reaction time. Equipment & materials: * Beaker * Stop Watch * 500 ml measuring cylinder * Cross on a piece of paper * Conical Flask * 30 mL of Hydrochloric acid (2M HCL) * 135 mL of Sodium Thiosulfate (NA2S2O) * 100 mL of Water Method: 1. Collect Equipment and Materials stated above. 2. Collect the total amount of Sodium Thiosulfate (135mL) and water (100ml) required for all the experiments. Each sample will need to have 50 mL of mixture in the conical flask at any time. Thus the amount of water and Na2S2O will be varied to make up this amount. ...read more.

Middle

Results: We observed that when the HCL was added into the conical flask that a murky perception formed in the solution thus the clear solution turned unclear. This can be explained by the following chemical reaction taking place; 2HCL (aq) + Na2S2O (aq) --> S(s) + SO2 (g) + H2O The table below captures the results we obtained; Table 1 Sample 2M HCL Amount of Na2S2O Amount of H2O Concentration of Na2S2O Time mL mL mL M Sec 1 5 45 0 0.225 15.37 2 5 35 10 0.175 15.40 3 5 25 20 0.125 25.06 4 5 15 30 0.075 39.25 5 5 5 40 0.025 169.86 Graph 1 Graph 2 Discussion: By collecting the results from the investigation we were able to come to a conclusion on the affects of varying the amount of Na2S2O and water has on the reaction of a solution. Graph 1 and Table 1 above shows the amount of Na2S2O and the amount of water in each sample. ...read more.

Conclusion

If in future tests, this gas was trapped inside the flask with the use of a stopper the reaction may have completed faster. * Reducing human error: Starting the timer at the same time in all the reactions would have helped to increase the accuracy of the results. The timer should have been started either once the full amount of HCL was transferred in the conical flask or should have started when the pouring started. * Another variable which could have been controlled was the number of times the conical flask was swirled after the HCL was added. This would have further helped with the accuracy of the data if all the samples were swirled at the same speed and the same number of times. * Using distilled water: this would ensure that the water is pure * There might have also been errors with reading the scales on the measuring cylinder as we were reading these to the best of our ability. To be certain that the exact amount of solution was added an electronic weighing scale could have been used. ...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 Classics 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 Classics essays

  1. Determination of the Partition Coefficient of Ethanoic Acid between Water and Butan-1-ol

    Shaking can increase the kinetic energy of the solutions and thus increases the temperature. Also, when touching the funnel, warmth of human palms may increase the temperature of the solutions as well. b) The two solvents are immiscible. This assumption is also invalid as butan-1-ol, being an alcohol, is slightly soluble in water.

  2. Chem Lab Report (Paper Chromatography)

    Otherwise, if the solute particles is highly polar, it will only stay in the stationary phase. In other words, the difference in partition coefficients of the solute particles enable the solute particles to move with different speeds. In this experiment, leusine has the highest solubility in mobile phase (least polar)

  1. Investigation of the effect of changes in ionic concentration on the e.m.f of a ...

    Cu 2+(aq) + 2e- Fe3+ + e- Fe2+ (aq) The overall equation for the reaction was 2Fe3+ + Cu(s) 2Fe2+ (aq) + Cu2+ (aq) The potential difference between the two half-cells drove electrons through the conducting wire from the negative copper wire to the positive nichrome wire.

  2. Charging and Discharging a Capacitor at Constant Rate

    c. the corresponding variations in charge and voltage are shown in Fig.d and e respectively. This experiment has to be performed skillfully with patience, especially in the final stage where you may find it difficult to keep the current constant. Fig.c Variation of current with time Fig.d Variation of charge with

  1. Determination of Chlorine and Iodine in Water

    4mL Volume used 2mL 11mL 3.5mL 11.5mL 3.5mL 10.5mL Concentration of Chlorine and iodine 2.50M .455 1.43M .435 1.43M .476 Average value Molarity 1.786M .455M Conclusion: The objectives of this lab were to standardize the sodium thiosulfate, because of microorganisms eating it the concentration changes over time and needs to be standardized each day it is used.

  2. To what extent is the theme of gender confusion used to create comic effect ...

    would have known that Agathon was quite an effeminate character in real life, but they still would have expected to see the actor dressed fully in masculine clothing. The costume worn by the actors is very important in this example of gender confusion.

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