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

To investigate the effect of changing the concentration of acid on the rate of reaction of Magnesium and Hydrochloric Acid.

Extracts from this document...


To investigate the effect of changing the concentration of acid on the rate of reaction of Magnesium and Hydrochloric Acid PLANNING In this experiment, the factor to be investigated is the concentration. This means that all other factors must stay the same or else this would not be a fair test. I am going to investigate how different acid concentrations affect the rate of the reaction with Magnesium. I will do this by monitoring how long it takes for a certain amount of Hydrogen to be given off. This means that I can measure how much a water level inside an area decreases due to the Hydrogen pushing it out. I have decided that I will wait until the water level reaches 50cm cubed before recording the result. This will measure the speed of the reaction. I chose this number because I should not have to wait too long for the water level to go down, but there is enough time to show how fast it's taking place. Similarly, I could have measured how much Hydrogen is given off in a certain time span. However, I am using the first option as I think it proves how quickly the reaction happens, rather than how much gas is produced. So it relates to the title better. I am going to use five different concentrations of acid and I'll change the concentration by diluting each volume of acid with a certain percentage of water. ...read more.


For every time it was measured, I found that the length was 5cm, the weight was 0.09 grams and the width measured 0.23mm. Therefore, the time taken for the water to be pushed out of the cylinder until 50cm� was not altered by any of these things. This is a table of all three experiments and a table of repeats. Each time, the water level had to reach the same place. I have written 'time taken' instead of rate of reaction because the whole reaction is not being recorded. It is only timed until the water level reaches a certain point. EXPERIMENT 1 Cm� of acid Cm� of magnesium Time taken (s) Water level (cm�) 50cm� 00 cm� 018.62 secs 50 cm� 40 cm� 10 cm� 041.03 secs 50 cm� 30 cm� 20 cm� 088.78 secs 50 cm� 20 cm� 30 cm� 171.29 secs 50 cm� 10 cm� 40 cm� 840.59 secs 50 cm� 00 cm� 50 cm� Infinity 50 cm� (s) = Seconds In the last result, there is no acid. There is no reaction between water and Magnesium, so a time is not recorded. EXPERIMENT 2 Cm� of acid Cm� of magnesium Time taken (s) Water level (cm�) 50cm� 00 cm� 009.97 secs 50 cm� 40 cm� 10 cm� 016.43 secs 50 cm� 30 cm� 20 cm� 050.06 secs 50 cm� 20 cm� 30 cm� 111.41 secs 50 cm� 10 cm� 40 cm� 327.97 secs 50 cm� 00 cm� 50 cm� Infinity 50 cm� (s) ...read more.


These things could have affected the results I got. I feel that the range of readings that I used was okay. Due to what I found on the graph, I realised that perhaps, using 40cm cubed and 50cm cubed was slightly inappropriate. This is because the graph showed that the difference in their times was not all that much, meaning that by 50cm cubed, the acid particles outnumbered the Magnesium ones, so the remaining particles were ineffective. It would have been better to not do 50cm cubed at all. However, it did help me to realise this. I also noticed that when I chose to time the reaction until the water level reached 50cm cubed, the reactions took slightly too long towards the end. This meant that we could not do another repeat and were slightly rushed. I think my method was suitable and was appropriate in relating to what we were supposed to find out. To make the method more detailed and accurate, it would be better to keep the conical flask the same throughout and perhaps even measure the temperature of the room as well. This is because variation in temperature can change the speed of a reaction as the particles have more energy. To get more evidence, I could widen the concentrations to see if my prediction about higher concentrations was correct and perhaps see how fast the reaction is when having a concentration of below 20%. I could also investigate the same thing by doing a gas syringe experiment, which might be more precise. Another way to monitor rates of reaction is by seeing how the factors of temperature and surface area can alter it. ...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 investigate the effect of temperature on the rate of reaction

    4 star(s)

    Catalysts Catalysts speed up chemical reactions. Only very small quantities of the catalyst are needed to result in a significant change in the rate of the reaction. This means that using a catalyst lowers the activation energy; therefore meaning that a greater number of molecules have energy that is more than what is needed for activation.

  2. The effect of Acid Rain on Seed Germination.

    Again this may have caused some slightly anomalous results in my final readings. Lastly, I found that when I needed to measure the seeds it proved to be very difficult. The cress' roots were all curled up and sometimes when I tried to uncurl then they simply broke off.

  1. How much Iron (II) in 100 grams of Spinach Oleracea?

    If in aqueous solution mop it up using plenty of water and run to waste, diluting greatly with running water. First aid If it has been in contact with the eyes, rinse immediately with plenty of water and seek medical advice.

  2. See how different concentrations of Hydrochloric acid change the rate of reaction with a ...

    Ways in which I will record my experiment There is several ways which I could record my experiment, but here are the two which I am planning to do: Amount of gas evolved I could use a gas syringe to collect the gas that will evolve from my experiment.

  1. Finding the Concentration of an Acid.

    The equation for this reaction is shown below: CR2O3 + 2Al Al2O3 +2Cr In this reaction Aluminium is the reducing agent. All metals are reducing agents, the more reactive a metal, the more powerful it is at bringing about reduction.

  2. whether the strength of Hydrochloric acid will affect the speed of the rate of ...

    Risk Assessment The acid that we are using in this experiment is of 2 molar strength, which is strong enough to at least cause irritation to the skin if spilled on it, the hydrochloric acid would also cause irritation to the eyes and mouth if ever spilled into those.

  1. The Rates of Reaction of Metals with Acid.

    Gas produced = 50cm3 / 1000cm3 � 0.04dm-3 � 24000 Gas produced = 48 cm3 For this reaction, 50 cm3 of acid and 0.04 grams of magnesium ribbon will be tested. The time will be stopped when my gas syringe reaches 40cm3.

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

    thus, the best amount of calcium carbonate to use, is 1.00 grams, this is because, it gives, a nice, quick experiment, but it is not too slow to do or too fast to time. The 2.00 grams experiments were getting a bit too slow.

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