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

We are going to find out how the concentration of hydrochloric acid affects the rate of the reaction between hydrochloric acid and marblechips

Extracts from this document...

Introduction

Rates of Chemical Reactions AIM: We are going to find out how the concentration of hydrochloric acid affects the rate of the reaction between hydrochloric acid and marble chips. PREDICTION: I predict that the higher the concentration the faster the reaction will take place this is because in a higher concentration there will more hydrochloric acid molecules which means that there will be a higher chance of the calcium carbonate (marble chip) molecules colliding with the hydrochloric acid and reacting. This should in theory increase the rate of reaction as the concentration is increased. The reaction rate, however, should decrease as the experiment progresses because as the reaction time increases the number of hydrochloric acid molecules present will decrease as they have been reacted to form water calcium chloride and carbon dioxide. Thus it will decrease due to a decrease in concentration. (2HCL+CaCO � CaCl +Co +H 0)- The reaction that takes place can be described using this formula. The increase in the concentration should be directly proportional to the increase of the reaction rate at a given time. This is because by doubling the number of hydrochloric acid molecules present the chance of a collision should be doubled, as there is now twice the possibility of a collision-taking place initially. ...read more.

Middle

As the experiment had now started I recorded the results every 15 sec. I did this for however long each of the molar tests took as they varied. I then changed the mass of the chips and the concentration of acid until I had all the data that was required. The experiment would be set up as shown above. PRELIMINARY RESULTS: (Result on table on next sheet) Preliminary description For my preliminary results I tested each molarity experiment twice to get a broader reading database and to compare results to and see if any errors had been made. For test one and the repeat the molarity was 2 (20ml hydrochloric acid) and so the results were very fast in both. 100ml of gas was collected in exactly 2minutes. Test two had no results as the molarity was 0 and there was no acid for the reaction to take place. In test 3 the acid and water concentrations are equal (1oml each) 1molar. I took longer to collect 100ml of gas than test 1 because I changed half of the concentration. I thought that it would take twice as long but it didn't because the surface area varies and so changes the speed that it dissolves in. In test 4 the results were fairly in between and nearer to 2molar readings but slower. ...read more.

Conclusion

average was 98ml at 105 seconds but tests 3and 8's average was also 98ml but at 270 seconds. There are some things that may affect the speed or way the bubbles move or how the gas is collected e.g.- While most of the tests gave small bubbles through the tube at a small and steady rate some of the tests (5 and 10) gave very large bubbles that only came up every 30-40 seconds. I think this is because air/gas is trapped underneath the delivery tube holder and is occasionally released after pressure builds up and so the bubble takes all of the water in one go giving a sudden surge in present readings at the time. Another way in which the tests could be made fairer is by changing the shape of the marble chips. Instead of having separate lumps/pieces off the calcium carbonate which all vary in surface area, shape and size, I think that the chips should be crushed into smaller segments which will solve the problem of one being bigger than the other. During setting up my equipment and replacing the solutions the measuring cylinder had to be turned upside down quickly into the water bowl. By doing this I believe that some water was displaced, as it cannot be possibly done accurately by hand. Overall I think that with the equipment and time given I was able to obtain enough evidence to back up 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 Aqueous 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 GCSE Aqueous Chemistry essays

  1. Marked by a teacher

    To see how the concentration of acid, reacting with potassium carbonate, affects the rate ...

    4 star(s)

    This will give me different concentrations of the acid. I will do a trial experiment to see if it works successfully because when I come to the experiment that counts I will know what I am doing and I will not make as many mistakes.

  2. Peer reviewed

    The Effect of Concentration on the Rate of Reaction when you React ...

    3 star(s)

    The curve of the graph shows that the rate of reaction is proportional to 1 divided by the time. The shape of the graph represents an inversely proportional shaped graph. The graph shows a decreasing time, so the rate of reaction is proportional to 1/time or it is inversely proportional.

  1. To investigate the rate of reaction between different concentrations of hydrochloric acid with metal ...

    at every 10 seconds as this is a suitable time interval for finding a measurable change to take place. I shall do the experiment as thus: 1. I will make sure the stools are tucked in and my bags are away, I will need a pair of goggles and an apron.

  2. Investigate the factors, which affects how quickly Calcium carbonate reacts with hydrochloric acid.

    0 0 0 0 0 30 24 25 26 25 60 34 36 35 35 90 39 40 42 41 120 55 54 53 54 150 61 62 60 61 180 75 73 74 74 210 90 89 90 89 240 99 98 100 99 70 degrees Celsius Time Taken-Seconds (s)

  1. Investigating the effect of concentration on the rateof reaction between marble chips and Hydrochloric ...

    This could have happened but it is impossible that the acid was more than 100% concentration, which it would have needed to be in order to produce more gas than the 100% concentration experiment. This only leaves the second explanation: That the surface area of the chips was larger.

  2. Investigate how the concentration of hydrochloric acid affects the rate of reaction between calcium ...

    To change the concentration of a solution, we dilute it by adding water. The predicted reaction additionally tells us that although the calcium carbonate or marble is soluble in water, the gas that is produced from this reaction (carbon dioxide)

  1. Investigation to show how the concentration of an acid effects the rate of its ...

    Also to check that we used the right amount of magnesium and right amount of acid/water together, so that the gas wouldn't be given off to quickly so we couldn't record accurately or too slowly so that it couldn't be completed in the amount of time available.

  2. Investigate how the concentration of 10 ml of hydrochloric acid affects the rate of ...

    However, if I don't manage to complete all the readings in one lesson (which I probably wont), I will need to carry out the other readings at a later date and the temperature of the room may be different then.

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