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

acid strengths affecting rate of reaction

Extracts from this document...

Introduction

GCSE Chemistry Coursework Aim My aim is to see how the strength of an acid varies how this affects the time is taken to produce 10ml oh hydrogen gas, using magnesium ribbon and 4 different strengths of HCL, 0.2m, 0.4m, 0.7m, 1m. Hypothesis I predict that the higher the strength of the acid, the quicker the time taken to produce the 10ml of gas required. I think this will happen as the stronger the strength of an acid the more h+ Ions to donate, so if the acid has more h(+) Ions then the higher the chance of it not only forming hydrogen gas but producing more of it, in a shorter period of time. Hydrogen gas is produced by, H2= 2H(+) + 2e(-). This then leaves the chloride ions, CL(-) to join with the magnesium and form a salt, magnesium chloride, CL(-) + Mg(+) =MgCL Fair Testing To make sure that the experiments are accurate and fair, I will use a fair and complicated procedure to make sure that the experiment is fair, thus giving more accurate results. These procedures are as follows; 1st I will make sure that the same amount (length) and weight of magnesium is used in each of the experiment, 2nd of all I will make sure that the same amount of HCL is put into the boiling tube in each of the experiments, I will be using 15ml of HCL through-out the experiments. ...read more.

Middle

I carried out several preliminary investigations. This allowed me to choose what strength acids would be best to use, because if the acid is too weak and take too long to fully dissolve then that is not an acid which I would consider appropriate to use in the investigation. Below is the results table from my preliminary investigations. Strength of Acid Time taken to dissolve 0.1m 1.55 minutes 0.4m 9.31 minutes 1m N/A I was unable to complete the experiment due to the time constraints of a 1 hour lesson; therefore I was unable to establish how long it took for all the magnesium ribbon to dissolve. Therefore it wasn't a fair test and they were inaccurate so I decided to change that experiment in favour of seeing how long it took the acids to produce 10ml of hydrogen gas. What I learnt from the Preliminary work The preliminary work showed me that using 0.1m hydrochloric acid was inappropriate, so I decide to not use it. To compensate and still use four strength acids I decided to use 0.7m as this was a realistic strength acid to be able to use in the experiment as it should react quite quickly and be achievable during one lesson. Using the equipment safely When carrying out the experiments I kept my goggles on at all times, I did this so the acid couldn't ...read more.

Conclusion

The accuracy of my observations again I feel was high, this can be backed up by my results as they returned no anomalies and they were very similar in cases when compared to the rest of the classes. Only minor things let the accuracy down, when stopping the stopwatch it is hard to stop it at the precise point when exactly 10ml of gas has been produced, so lowering the accuracy. Improvements which I could do to the method are to take more time when carrying out the experiment. As I had to stay within the time constraints of one lesson I couldn't spend as much time on being as accurate as I would have liked, although they were still accurate to a certain mark and are still very reliable. The reliability of my evidence is again as they are similar to others results from other experiments which were carried out in the same class, so they can be used without fear of them being in accurate or unreliable. The evidence I recorded is more than sufficient to firmly support my conclusion, as the conclusion states that as the strength of the acid increases the time taken to produce 10ml of hydrogen gas de-creases, which when compared to the evidence is exactly the same. So the evidence is more than sufficient so support a firm conclusion. Michael Kemp 1 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Physical 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 AS and A Level Physical Chemistry essays

  1. Investigating the rate of reaction between peroxydisulphate(VI) ions and iodide ions

    a temperature change from 320K to 330K causes the average velocity of the molecules increases by a factor of 1.016, about 1.6%. The rate actually increases by much more than this, sometimes by 200% to 300%. Therefore, this demonstrates that temperature not only has an effect on the number of collisions, but also with how much energy they collide.

  2. Investigating how concentration affects rate of reaction

    Secondly I need to find the best way of stirring the mixture whilst the reaction occurs. Preferably, I need a way of stirring which will reduce the time taken for the solution to go colourless. This would mean that I can fit in more repeats and more concentrations of potassium bromide can be tested.

  1. Neutralization investigation

    I will wash the burette with distilled water- it must not be tap water as this does not have a pH of exactly 7 so it will not remove all alkaline or acidic substances from the burette. It is important because if any of the acid is left in the

  2. How do we make Magnesium and Hydrochloric acid react faster?

    Firstly I had to find a suitable length of magnesium ribbon which was to stay the same length through out the investigation. Secondly, the volume of acid, which is to react with the magnesium ribbon. The size of the ribbon that I finally have decided to use in my investigation is 11.5cm.

  1. The Determination of rate equation

    3 Graduated pipette (10cm3) - used to measure the amount of HCl, Na2S2O3 and distilled water; as it is more accurate than using measuring cylinder. 2 beakers - used to collect HCl and Na2S2O3 from the main source. 1 White tile - used to place underneath the HCl and Distilled water solution.

  2. Investigating the Rate of the Reaction between Bromide and Bromate Ions in Acid Solution

    This can explain many of the factors which affect rate of reaction. Increasing the concentration or the pressure of a reactant means that there are more reacting particles in the same volume of solution, so collisions are more likely, meaning that more collisions happen in a given amount of time.

  1. Magnesium and hydrochloric acid react together readily. Plan and carry out an investigation testing ...

    The smaller the pieces the larger the over all surface area, this will result in an increased number of collisions, and an increased reaction time. ----------------------------------------- After having looked at all the possible options of what I could look at, I have decided to find out how the concentration of Hydrochloric acid effects the rate of reaction.

  2. Individual investigation - Reaction to be studied Rate of reaction between propanone and ...

    us that the reaction is first order > Second order: If the concentration is exponentially decreasing with respect to time, then the half life must be greater than initial half lives which tell us that that reaction is second order.

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