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

Investigating the effect of temperature on the rate of chemical reaction when an Alka-Seltzer tablet is dissolved in water and to estimate the temperature change needed to double the rate of reaction.

Extracts from this document...


Investigating the effect of temperature on the rate of chemical reaction when an Alka-Seltzer tablet is dissolved in water and to estimate the temperature change needed to double the rate of reaction. Aim: I will carry out this investigation to find out the temperature change needed to double the rate of chemical reaction when an Alka-Seltzer tablet is dissolved in water. Plan:- ? Variables The list below is the factors of variables, which could affect my investigation. It is important in any experiment that these factors are controlled, so reliable, accurate and fair result to be obtained from the investigation. In my experiment, it will be essential for me to keep some of variables the same and under control, not only for a fair test but to obtain reliable results. * Mass of tablet - If the mass is greater in one of the tablets, there will be more molecules which can react with the water. This causes the rate of reaction to speed up. I will make sure I weigh each tablet using the top pan scales. I will make sure the weight of the tablets are roughly the same. ...read more.


Therefore, for a chemical reaction to occur, effective collisions must be occurring. These collisions have a sufficient energy. Every chemical reaction has a certain Activation Energy and to increase the rate of reaction you must increase the possibility of the reactant particles having that energy. One of the ways of doing it, is to increase the temperature. The higher the temperature, the greater the kinetic energy of the particles, therefore there will be more collisions with enough energy to make reaction happen. This is explained in the Maxwell-Boltzman distribution below: When the temperature is low, the particles do not have enough energy to pass the Activation Energy line. Only a few of them do. This means that only a few molecules have the required energy to react with other molecules. Therefore, the rate of reaction is slow. However, when the temperature is high, more molecules pass the Activation Energy line and react with the other molecules. This means the rate of reaction increases, as there are more collisions. The Maxwell-Boltzman distribution curve shows us the Activation Energy and how many molecules have the required energy to react. For T1, which is a lower temperature, it is clear that most of the molecules do not have the required energy to pass the Activation Energy line. ...read more.


Therefore, this should lead to the tablet dissolving in the water at a faster rate. Once the tablet has dissolved, the reaction can take place. The reaction is between the two distinct types of particles that the Alka-Seltzer tablets are made of. These are Sodium Bicarbonate particles and Citric Acid particles. When these collide with enough energy to break their bonds, they cause a reaction, which results in the production of carbon dioxide. It is this gas, which is collected in the gas syringe, and used to work out the rate of reaction. The temperature affects this reaction, by providing the particles with more or less energy. A larger amount of energy does two things, both which help to increase the rate of reaction. Firstly it means the particles can more about faster, so have more of a chance of multiple collisions. Secondly, it means the particles collide with enough force to break the bonds and cause the reaction. The equation for this reaction is; Sodium Bicarbonate + Citric Acid ~> Carbon Dioxide + Sodium Citrate + Water Other than temperature, the concentration of the solution also affects the speed of the reaction. The smaller the volume the faster the reaction as the particles is spaced out over a smaller area. This means that collisions will be more frequent than if the solution was much more concentrated. ...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. Peer reviewed

    Rates of Reaction

    5 star(s)

    Catalysts: a catalyst is a substance which increases the rate of a chemical reaction, without being used up in the process. It can be used more than once to increase the rate of conversion of reactants into products. A catalyst lowers the amount of energy needed for a successful collision (activation energy)

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

    This is because if the mixture is not evenly stirred the reaction rate changes at different speeds. This changes the overall rate of reaction and makes the results uneven and therefore inaccurate. These are the key factors which can affect the experiment.

  1. Investigating Factors Affecting the Rate of a Chemical Reaction

    Make sure all safety precautions are setup- safety goggles and safety mat etc. In a conical flask add 5cm3 of 2 moles/dm3 of HCL acid along with 50 cm3 of THIO at one of the 5 different concentrations (0.03, 0.06, 0.09, 0.12 & 0.15 moles/dm3), which is being investigated.

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

    A catalyst is a separate substance to the ones you use in your experiment and is used to speed up the reaction between the reactants. Only a minute amount of the catalyst is required to produce a dramatic change in the speed of the reaction.

  1. Change in reaction times due to alcohol consumption.

    Participants have to have had no alcohol in system before hand. - (Making sure by doing my participants know the riles and procedures before the experiment) Gender of participants will stay the same throuout the experiment. Time- Keep the same time distance between intoxication and doing the response time tests.

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

    But if looking at the effect of varying the concentration of catalase, the concentration of hydrogen peroxide must be controlled so it is kept constant - otherwise there will be two variables changing at the same time and the results will therefore be two-tailed.

  1. The effect of temperature on the rate of reaction

    There are two ways in which the magnesium oxide can be removed, both are listed below: - Dipping the Magnesium strip in the acid solution. Or - Removing the layer by rubbing it off with sandpaper. However the problem with dipping it in acid is that you then immediately have


    However, if some have been left in for a shorter period of time than others, then osmosis will have had less time to occur in. Meaning that the volume of water that has left or entered the cell will be lower than that of the other samples.

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