• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11

What factors effect the rate of reaction at which Alka-Seltzer tablets react with water.

Extracts from this document...

Introduction

WHAT FACTORS EFFECT THE RATE OF REACTION AT WHICH ALKA-SELTZER TABLETS REACT WITH WATER SKILL P - PLANNING INPUT VARIABLES * Surface area of Alka-Seltzer tablet - this variable I will keep constant during the experiment. To ensure that the experiment is fair. I will do this by making sure that when I investigate each temperature, I will keep the surface area of the Alka - Seltzer tablets the same. * Volume of tap water used - this variable I will keep constant during the experiment. To ensure that the experiment is fair. I will do this by making sure that when I investigate each temperature, I will keep the amount of tap water used the same. * Temperature of the tap water - this is the variable I have chosen to investigate. Reactions can be made to go faster or slower by changing the temperature of the reactants. I will measure the temperature of the tap water by using a thermometer. * Number of Alka-Seltzer tablets used - this variable I will keep constant during the experiment. To ensure that the experiment is fair. I will do this by making sure that when I investigate each temperature, I will keep the number of Alka - Seltzer tablets the same. OUTPUT VARIABLES There are three main output variables that will change as a result of my input variable (temperature). The first one is time. This will change, because as the temperature increases, the rate of reaction will speed up making the time less. The second output variable that is changed, as a result of my input variable is the amount of bubbles produced. This will change, because as the temperature increases, the rate of reaction will speed up causing more bubbles more quickly. The last output variable that will change, as a result of my input variable is the amount of heat produced. ...read more.

Middle

Firstly because I am using a 250ml beaker, the height of the water has to high enough for the tablet to react properly, therefore 50ml or 20ml is not a sufficient volume. Secondly if I chose 150ml then the reaction may take place too quickly, therefore the results I get may not be very accurate. * In the 400ml beaker I am going to use 150ml so that it is enough to cover the 250 ml beaker that is going to be placed in the 400ml beaker. * A splint will then be taken, which will be used to light the Bunsen Burner (which will be on a safety flame). The Bunsen Burner will be used to heat up the water bath. * A thermometer will then be taken and placed into the 250ml beaker. This is done so that the temperature can be measured and later recorded. * A timer is then obtained so that the time for the Alka - Seltzer tablet to dissolve can be recorded. * The Bunsen Burner will then be turned onto a roaring flame to heat the water bath. * The water bath will then be taken and placed on top of the gauze. This is done to heat the water bath. * Once the temperature reaches 20�C, one Alka - Seltzer tablet will be dropped into the 250ml beaker, (just above the water line) and the timer is started. It will be dropped into the beaker for each experiment just above the water line, so that it is a fair experiment. This will be the first temperature that will be investigated. * The beaker will then be taken off the gauze using a tong, (so that I do not burn my hands) but it will remain in the water bath. This is so that it maintains its temperature. * The timer will then be stopped when the Alka - Seltzer tablet has completely dissolved and the time will be recorded and so will the temperature. ...read more.

Conclusion

stopped it rising or falling). Although I tried my best to make the experiment perfect there were some unavoidable inaccuracies with the experiment. Firstly, when testing lower temperatures, the temperature of the water bath, which was much higher than the actual temperature being tested, caused a rapid increase in the temperature, or if it were lower it would cause it to decrease rapidly, especially when taken off the Bunsen. These gave us results for inaccurate temperatures to which were we testing. To overcome this problem, a thermostatic water bath would need to have been used, since it can be set to a certain temperature, and it will stop when it reaches there. Also it would mean that the solution inside it would reach the exact temperature or close to it., and not increase or decrease once the water inside it has reached equilibration. Secondly, it was impossible to say when exactly the Alka-Seltzer tablets had completely dissolved and consistently decide this for every result obtained. This was a huge flaw in the experiment and affected the results in a big way. To overcome this problem a special piece of apparatus would be needed to decide exactly when they had dissolved each time and give us the same measure of consistency each time. To improve the quality of the results, the same piece of apparatus would have needed to be used throughout the whole experiment, and not changed for repeat results. To extend my inquiry and provide additional evidence for this experiment, I think that I could have investigated up to higher temperatures and see how the link would break down, and how the results would fit in with the trend of results. Also, it would have helped me to see how the decomposing of the dissolved substances affected the results. To improve the experiment and make it fair, distilled water should have been used instead of tap water because it is purer than tap water and does not contain impurities. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour 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 GCSE Patterns of Behaviour essays

  1. The aim of the experiment is to find out the rate of reaction at ...

    This is one full tablet produced by the company. Stirring- When the reaction is taking place if you stir the mixture it will increase the rate of the reaction. This is because by stirring the rate of dissolving of the tablet is increased. In this experiment I am not going to stir the mixture.

  2. Coursework: Effect of Temperature on the Rate of Reaction between

    Each experiment will be repeated at least twice and an average will be taken. This will ensure that results that are inaccurate will be noticed and the time will be as accurate as possible. The only variable in the experiment will be the temperature; the amounts of HCl, Na2S2O3 and everything else will be kept constant.

  1. To investigate the effect of varying the masses of white sugar and yeast and ...

    The white sugar was dissolved completely by stirring with a glass stirring rod. The 2,000mg of yeast was then added quantitatively to this mixture and the volume made up to 100ml with glass distilled water. The mixture was left to stand for exactly for 5 minutes and the bubbles observed indicated ongoing fermentation.

  2. Find out how the rate of hydrolysis of an organic halogen compound depends on ...

    The reaction is at its fastest at the start, when the concentration of hydrogen peroxide in solution is high, before any has been used up. * The graph gradually flattens out. This is because, as the hydrogen peroxide is used up, its concentration falls.

  1. To investigate by the use of an experiment to measure the effect of changing ...

    It is then when the collisions become more frequent, that the rate of reaction increases. > Temperature is a variable which is pretty hard to keep constant in a class laboratory environment; therefore we can check the temperature before and after, instead of using water baths.

  2. Determine the effect temperature has on the rate of reaction.

    If it does the change of volume can be followed by using an apparatus fitted with a capillary tube; dilatometry. 4. Electrical conductance - the change in total number of ions can be measured through electrical conductivity of the solution.

  1. What factors effect the rate of a chemical reaction?

    Diagram of activation energy: From the diagram it is possible to see that an increase in temperature causes an increase in energy so bonds are broken more easily. I have ensured that I referred to a variety of different sources to make my information more accurate and my prediction more reliable.

  2. Investigate various ways of increasing the rate of a chemical reaction and evaluate which ...

    The apparatus needed for this is illustrated below: The second method, provided that the gas is able to leave the container, can be done by observing a decrease of weight of the reactants as gas is lost. This method would not be very suitable for the last reaction as it

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