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

Investigate whether changing the molar of hydrochloric acid affects the rate of reaction when it is added to calcium carbonate chips.

Extracts from this document...

Introduction

Aim Our aim is to investigate whether changing the molar of hydrochloric acid affects the rate of reaction when it is added to calcium carbonate chips. Prediction/ Hypothesis I predict that the higher the molar of acid the faster the rate of reaction will be with the marble chips. This is because with a higher molar of acid there will be more acid particles to collide with the calcium carbonate, therefore causing a reaction in a faster time. With a lower molar of acid there will be more water molecules, resulting in the less chance of collisions with the calcium carbonate. In the graph there should be a gentle curve in the line of best fit as the molar decreases. Independent variable This will be the variable that I am changing in the experiment. The easiest variable to change and the one probable to give the most accurate results is changing the molar of the hydrochloric acid. I am going to make up different molars of acid by adding water to a 3M acid. My molars will range from 3M to 1M, these will also include 1.5M and 2.5M. Using these molars I hope to achieve a good range of results and a good graph. I will make up the different molars using these formulae: 2.5 molar - 25cm� HCL + 5cm� H20 2 molar - 20cm� HCL + 10cm� H20 1.5 molar - 15cm� HCL + 15cm� H20 1 molar - 10cm� HCL + 20cm� H20 Dependent variable This will be the variable that I am measuring. ...read more.

Middle

I have decided to use a mass of 10g marble chips. If the mass is not kept constant on all the experiments, we can expect the averages to be incorrect. If there is more chips used the reaction time will be shorter because there is more chips for the acid to collide with. If there are less chips the reaction time will be longer, because there will be less chips for the acid to collide with. I will make sure that the mass remains the same, by weighing the chips for each test on an electronic balance. Volume of hydrochloric acid - if there is a greater volume of acid in the tests, the reactions times will be shortened, because there will be more acid particles to collide with the chips. The amount of acid I have decided to use is 10cm3. I have chosen this because it will be easy for me to make up the molars. To make sure that I keep this the same I will accurately measure out the acid in a measuring cylinder. Size of marble chips - this is something we must take into consideration, although we do not have much control over it. A large chip size will react faster because it has a larger surface area. Molar of the acid - even though we are changing the molar in this experiment, it is very important that the molar stays the same. ...read more.

Conclusion

molar - 20cm� HCL + 10cm� H20 1.5 molar - 15cm� HCL + 15cm� H20 1 molar - 10cm� HCL + 20cm� H20 Diagram Results table MOLAR TEST 1 TEST 2 TEST 3 AVERAGE 3 6.62 7.01 7.14 6.9 2.5 9.41 10.87 11.12 10.47 2 15.02 15.37 15.15 15.18 1.5 20.7 29.95 44 48.21 1 133 79.18 228 146.7 Conclusion My predictions that I made were correct, and are supported by my results and graph. The graph is significant indication in the relation between affecting the molar of acid. The line of best fit shows that there is a dramatic drop between the time it takes for the acid to react with the marble chips on the 1 and 1.5 molar, but then the decrease slows down and becomes more gradual. Evaluation If I had more time I would like to of made more tests to improve the average, also I would of liked to of tested a wider range of molars to see if the decrease in reaction time is more or less dramatic with higher molars. I thought we conducted the experiment very well and efficiently, however, we did have some anomalous results in several of the molars, this may have been down to a number of variables as described earlier in the exploration; such as concentration of the acid. We ignored these results and repeated the test when we came across them, with this the anomalous result did not appear again. ...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)

    I will be setting up the experiment in the same way each time so to keep it a fair experiment (see diagram). Diagram: As the hydrochloric acid and the potassium carbonate react, carbon dioxide is produced. The gas is collected in an upside-down measuring cylinder (the gas displaces water in the measuring cylinder).

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

    Technique 1-Gas syringe Equipment: -A 100cm3 gas syringe -A 100cm3 conical flask -A clamp -A stand -Rubber tubing -Calcium carbonate granules -Hydrochloric acid (maximum concentration=2 mol dm-3) -A 100 cm3 measuring cylinder -Stop watch (time measured to nearest second) Method I have used the gas syringe experiment; I timed how

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

    One thing that I did not expect was the upward curve on some of the graphs of the lower concentrations of acid. I put this down to reused chips. Because some of the chips we used had been used before, they will have had a coating of something on them

  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. What Factors Affect the Rate of Reaction Between Hydrochloric Acid and Calcium Carbonate?

    Therefore there will be fewer molecules reacting in a certain space of time, slowing the rate of reaction. High concentration of acid. Low concentration of acid. The solution in both the diagrams is hydrochloric acid, however the solution in Fig.1 is more concentrate than Fig.2 (the acid molecules are red and the water molecules are blue).

  2. to investigate how the concentration affects the rate of the reaction

    If the acid is dilute, there is more space between the particles and have to travel a while before colliding and reacting with other particles. The reaction will take time thereby reducing the rate of the rate of the reaction.

  1. Investigating how the concentration of hydrochloric acid affects the rate of reaction with Calcium ...

    I will do this by recording what level the water is at in the measuring cylinder every 10 seconds. Hydrochloric acid is an irritant and I will therefore handle it with care and always wear safety glasses when performing the experiments.

  2. Experiment to see how the quantity of marble chips affects the rate of reaction ...

    It is also not very clear what the universal indicator reads, as it is colour coded, you could be several PH points off what it actually is. Reacting an acid with a carbonate is safe, and it is easy to record the amount of carbon dioxide produced using an upside down measuring cylinder.

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