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

To investigate how concentration of acid affects the rate of a reaction. Hypothesis: I predict that as the concentration of the acid increases

Extracts from this document...


Rate of Reaction Investigation Aim: To investigate how concentration of acid affects the rate of a reaction. Hypothesis: I predict that as the concentration of the acid increases, the rate of reaction will increase. This is because the more particles of acid there are, the more collisions between particles will occur. This is important because chemical reactions only occur when reacting particles collide with each other. I believe if I make the concentration of the HCA stronger I will get a quicker reaction. I constructed my hypothesis from a few basic ideas, one that all things are made from particles, two if two reacting particles collide with each other they will cause a reaction, and three all reactions have equations, and equations have two be equal on both sides. I.e. 7= 2+X, X would have to be 5, so if the amount one side is increased the other side must be increased. If I have a box with 5 purple balls, 4 green balls, and many blue balls, there would be a low chance of the purple and green balls colliding. This is the same situation with HCA and SCC, if there are 5 SCC particles, 4 HCA particles and many water particles then ...read more.


The amount of lime stone used- if this were to change, the rate of reaction would be affected because more limestone would take longer to fully react with the acid. Temperature- if this were to change it would affect the results because it would speed up or slow down the particles, causing either more or less collisions between particles. The input variable in this experiment is the acid concentration and the output variable is the rate of reaction, measured by how much carbon dioxide gas is produced. Apparatus: Burette, beaker of water, flask with tube, hydrochloric acid, limestone. Method: Limestone is put into the flask filled with hydrochloric acid. The bung connected to the tube is put on the flask. The gas produced travels along the tube and is released up the burette filled with water. The carbon dioxide produced displaces some of the water in the burette. The gas produced is measured using the burette, to show the rate of the reaction. The experiment is repeated for different measurements of concentration. For each measurement of concentration the experiment will be repeated a minimum of three times to ensure accuracy and to delete any anomalous results. ...read more.


Chemical reactions only occur when reacting particles collide with each other, so the higher the concentration of the acid, the more acid particles there are to collide with the limestone particles. Evaluation: There were a few anomalies in my results. This could have been down to taking too long to put the bung on the flask, which would have meant some gas would've been lost, or not all the gas produced going up the burette. The results could have also been affected by the surface area of the limestone. Although it is easy to keep the same mass of limestone used in the experiment, each piece would have had a different surface area which would have affected the results because the larger the surface area, the faster the rate of reaction because more limestone particles would have been exposed to the hydrochloric acid in pieces of a larger surface area. To extend this investigation I could use higher concentrations of acid to see if the results level out as the concentration gets higher, or if the rate of reaction continues to go up. I could also experiment with other factors that would affect the rate of reaction, like temperature and surface area of the limestone. ...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 Patterns of Behaviour 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 Patterns of Behaviour essays

  1. An investigation to find out how the concentration of acid affects the rate of ...

    84.32 84.31 84.31 84.28 84.27 84.27 84.46 84.33 84.29 84.26 84.23 84.20 84.19 84.18 84.16 84.15 84.15 Total decrease in mass: 0.30g 0.32g 0.31g 1.5M concentration: Time (minutes) Mass (grams) including flask 1st Test 2nd Test Average 0 1 2 3 4 5 6 7 8 9 10 84.35 84.11

  2. How Concentration affects the rate of reaction.

    By repeating the results I can spot anomalous readings and see what went wrong. I will use 5 different concentrations of sodium thiosulphate for 5 experiments. Fair Testing This experiment must be accurate in order to be sure that what I find out at the end of the experiment is true.

  1. Effect Of Substrate Concentration On The Activity Of Catalase

    had the fastest rate of reaction at the start of the reaction. This can be explained by using the rate of reaction theory. In a reaction, reactants are being used up and products are forming. So the amount of reactants fall and the amount of products rise.

  2. Enzymes - show how substrate concentration affects the rate of reaction for an enzyme ...

    For example at the temperature of 20�C after 30 seconds the volume of oxygen I collected was on average 0.85 cm� (see results preliminary results table). Hence the percentage error was: Percentage error = Smallest division � 100 Measured quantity Smallest division of the measuring cylinder = +/-0.5cm�, this is the scale to which I could read as accurate to.

  1. Find out how the Acid concentration affects the rate of reaction between hydrochloric acid ...

    I think that it would make the experiment go faster if I had more chips with a higher mass. This would make the experiment run faster, especially at the lower concentrations. Acid concentration (mol/dm3) Mass of limestone (g) Number of limestone chips Temperature Volume of acid (cm3)

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

    All four methods of increasing the rate of reaction can be explained in terms of increasing the number of collisions. Temperature increases the number of collisions. When the temperature is increased, the particles all move quicker. If they're moving quicker, they're going to have more collisions.

  1. Investigate how the level of concentration affects the rate of reaction.

    The results would then be put onto a table and the results converted into a graph. The experiment that I am going to use for the investigation is: Sodium Thiosulphate + Hydrochloric acid Na2 S2 O3 + 2HCl 2NaCl + S + SO2 + H2O Plan To see the affect

  2. An investigation into how the concentration of an acid affects the rate of a ...

    Catalysts-Catalysts enable substances to react more easily. They do this by helping bonds between atoms to break and form more easily. The particles need less energy to react, so the reactions proceed more quickly. Catalysts increase the rate of reaction with out being used up so they can be used again.

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