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

Investigate the Time Taken for a Reaction to Take Place Between Antacid Tablets and Hydrochloric Acid with a Varying Concentration.

Extracts from this document...

Introduction

Chemistry Coursework to Investigate the Time Taken for a Reaction to Take Place Between Antacid Tablets and Hydrochloric Acid with a Varying Concentration. Background Chemistry The experiment consists of an antacid tablet reacting with hydrochloric acid. The chemical symbol for Hydrochloric acid is HCl. This means that it consists of hydrogen and chlorine. The part which reacts in the experiment is hydrogen. The antacid tablet consists of calcium carbonate, sucrose, maize starch, calcium searate, peppermint oil and saccharin sodium. The part which reacts in the antacid tablet is the calcium carbonate. The reaction between calcium carbonate and hydrochloric acid is as follows: Ca CO3 + 2HCl CO2 + H2O + CaCl2 Calcium carbonate + Hydrochloric acid Carbon dioxide + Water + Calcium Chloride The gas which I am collecting in a measuring cylinder will be carbon dioxide. The reaction will look like this: The hydrogen ions and the calcium carbonate ions must have a successful collision for a reaction to take place. Not all collisions will be successful. During my preliminary experiments I discovered that five concentrations would be the ideal amount to study. Less than five concentrations would give a less accurate graph and there would not be a sufficient amount of results to study or make a prediction. I found that more than five concentrations was unnecessary and although would have made the graph more accurate, it would have taken too much time and too many tablets. ...read more.

Middle

Instead of timing the reaction until the tablet has dissolved I will time it until it has produced 50cm� of gas. I will then repeat the experiment three times for each concentration and average out the results making sure to take away the extra ten seconds off the recorded stopwatch time. To conduct this experiment safely I will have to wear goggles, gloves and a lab coat. I will wear gloves and goggles to protect my eyes and skin because the acid I will be using will be 4 molar hydrochloric acid, which is very caustic. If it were to come into contact with my eyes then it would burn through my retina making me blind, similarly if it were to come in contact with my skin then it could cause serious damage. The results from this experiment will have to be fair. To make them as fair as possible I will have to do several things:- * I will have to use a thermometer to check the temperature of the acid. The temperature could change my results dramatically. The hotter the acid, the faster the reaction. Heat changes the rate of collision because it makes the atoms vibrate more and gives them more energy, increasing the chance of a successful collision. From my preliminary results I found out that the average temperature of the acid was 19�, so I will try to keep the temperature of the acid as near to 19� as possible to make it a fair test. ...read more.

Conclusion

The graph looked like this: 4 2 Concentration (Molar) Rate I conclude that when you increase the concentration the time taken decreases. When you increase the concentration the rate of reaction increases and the two are directly proportional to one another. I have drawn this conclusion from my evidence and my scientific knowledge of the collision theory. The processed evidence shows that as the concentration increase the time taken decreases. This is consistent with the collision theory. The collision theory states that a reaction can only take place if particles collide with each other. The more particles there are to collide, the more chance of a successful collision. My results support my prediction. I predicted that when the concentration of hydrochloric acid is increased, the rate that the reaction takes place will increase. I predicted that if the concentration of hydrochloric acid is doubled then the rate of reaction will also double and the concentration and the rate will be proportional to one another. The graphs support this because as 2 molar is doubled to 4 molar the rate of reaction doubles from 0.014 to 0.028. I then tried 1 molar doubled to 2 molar and the rate doubled again from 0.010 to 0.020. My results also show that when you increase the concentration the time taken decreases. I drew across from 4 molar and then down to time taken and the time was 152 seconds, I then drew across from 1 molar and the time taken was 37 seconds. This proves my prediction. ...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. Free essay

    Close Your Eyes

    I wasn't looking forward to it. After all who wants to sit in one big hall on their own while everyone around them has a good old laugh with their mates? So of I went, to the hall where I sat on my own and ate my lunch.

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

    The changes are associated with first the formation of gluten, which requires both the hydration of the proteins in the flour and applied energy. The role of energy in the formation of gluten is not always fully appreciated. It is often erroneously associated with particular breadmaking processes, especially those which employ higher speed mixers.

  1. How varying the concentration of Hydrogen Peroxide changes the rate at which an alginate ...

    I chose the two extremes and the middle amount of concentration of both water and hydrogen peroxide. I found that many of my beads floated when I used the yeast-alginate solution with a ratio 1:1. To prevent the beads from floating, I made the beads thicker by adding some extra alginate.

  2. Effect Of Substrate Concentration On The Activity Of Catalase

    At the same time start the computer as you inject the catalase, to start of the measurement of the temperature, of the hydrogen peroxide 9. Watch how the computer measures the temperature for 2minutes as it transfers all the information into a graph 10.

  1. Investigating making Epsom salts by varying the rates of reaction.

    Do not induce vomit and then seek medical help. If splashed in eye: care should be taken when handling this acid as it is a very corrosive solution. If in contact with eye then make sure you flood the eye with tap water for 10 minutes and then seek medical attention.

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

    I decided to use the water bath, because I found that it maintained the temperature better. I then had to decide what volume of water to use. I did this by taking one temperature (I chose 40�C) and reacting an Alka - Seltzer tablet with it.

  1. ICT modelling spreadsheet - This coursework was designed to investigate the uses of electricity ...

    Below this, there would be the additions, standard charge plus the V.A.T., and then finally the total billing cost. The columns, which contain formulae, are the total amount of hours (per week). This is calculated by multiplying the amount of times each item is used per week, by the average time it is used for.

  2. Investigate the effect of varying the concentration of hydrochloric acid with the rate at ...

    As in a previous experiment, the Enzyme catalase was very efficient in speeding up the rate at which hydrogen peroxide decomposes. There are a number of ways enzymes can be used as shown: Enzymes Hydrogen Peroxide decomposes very Hydrogen slowly into water and oxygen.

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