• 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)

    Increasing the concentration of the reactants will increase the frequency of collisions between the two reactants. The molecules in the reaction mixture have a range of energy levels. Therefore, increasing the concentration would increase the kinetic energy in the particles; resulting in a greater chance of colliding, and also an increased likelihood of these collisions being successful.

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

    My range of data is 4 minutes; this is so that I will have enough time to finish other experiments, and not to stay too long on one experiment. Here are the lessons that I have learned from the preliminary experiments for Technique 1: Problems 1.

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

    Chemistry (fourth Edition) Raymond Chang Van Hoffman Press Inc.-America (1991) 8) A new introduction to Biology (AS AQA Biology Specification A) B. Indge, M. Rowland, M. Baker Hodder and Stoughton Eductional-London (2000) 9) Chemistry Ann and Patrick Fullick Heinemann- Oxford (1994)

  2. Investigating the effects of changing the concentration of different solutions on the refractive index ...

    RMM of sugar Upper limit of maximum mass of sugar to be put in = (0.2530 � 0.0051) mol ? 180.2 g mol-1 = (45.5906 � 0.9190) g Lower limit of maximum mass of sugar to be put in = (0.2490 � 0.0050)

  1. Rates of Reaction

    There is now more chance of a successful collision-taking place, as there are more particles that contain the activation energy needed to form products by breaking bonds and form new ones. As you can see from the graph on the left shows the relationship between concentration and time; it shows

  2. Rate of Reaction

    Pressure - Increasing the pressure is similar to increasing the concentration. The particles will collide more frequently at a higher pressure and increase the rate of reaction. The pressure though only has a big effect on gases and not liquids, which is why it will not be a major factor to control.

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

    reading 4th reading 0.06 12 4 20 25 28 23 26 40 37 44 37 24 60 45 54 44 28 80 51 60 47 52 100 55 61 47 53 120 55 61 Stopped 53 140 Stopped Stopped Stopped The third reading was wrong because too much gas was

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

    I have decided to do the experiment using the gas syringe method; I made this decision using several things from the preliminary experiments the first was the fact that the gas syringe method was quiet a lot more accurate than the burette method.

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