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

Find if changing the concentration of an acid will increase or decrease the rate of the reaction when marble is dissolved in hydrochloric acid.

Extracts from this document...

Introduction

Experiment Aim To find if changing the concentration of an acid will increase or decrease the rate of the reaction when marble is dissolved in hydrochloric acid. Apparatus Marble Chips Conical Flask Hydrochloric Acid Gas Syringe Delivery Tube Stop Watch Fair Test To make the experiment a fair test I will use the same amount of acid for each concentration. I will do this by using a capillary tube because they are very accurate. I will use 3g of marble in each concentration of acid. I will clean everything out before I start the next experiment with a different experiment. Safety Magnesium is flamable and when it reacts with acid an exothermic reaction takes place releasing a large amount of heat energy. Acids are corosive so saftey glasses must be worn. Method I will use Marble chips all of a small size. I have decided to use 3g or marble chips. The amount of acid I have decided on is 20ml. I will measure this by using a burette, a very thin tube that lets out the acid when you turn the tap; it gets very accurate amounts of acid. ...read more.

Middle

Also if the particles have more energy, they will be travelling faster, making them collide more frequently. Variables/Factors Variables 1. The amount of marble chips will not vary because more marble chips would produce more gas when put into the HCL, so a weaker concentration of acid, could end up looking stronger than a stronger concentration of acid. 2. The amounts of acid will not vary because more of a weaker concentration could be as strong as a little of a stronger concentration, which would make an unfair test. 3. The strength of the acid WILL vary because the whole point of the experiment is to see how much gas is produced at different concentrations of acid. 4. The apparatus used will be the same every time because other pieces of apparatus may have a different scale, the syringe may be stiffer. Etc. 5. The time between measurements will not change so you can see how much gas is produced in the same amount of time. 6. The temperature will have to be the same in each experiment because 10 Factors 1. We will take measurements every 10 seconds 2. ...read more.

Conclusion

(You can see ive circled this in the graph) Although I have some ideas which may gain a more accurate reading. Firstly, the surface area of the marble chips were not perfect. It could have been made better if I had used powdered marble chips because the surface area of each wieght of powder would have been a lot similar. If I did use Powder however, the concentration of acid may have had to be weakened as the reaction would have taken place a lot quicker due to the very large surface area and readings wouldn't have been as accurate. Secondly, an inaccuracy may have been caused by the fact that the temperature may have dropped during the reaction. This could have been used if I used a water bath to heat up the acid to a constant temperature. You have to allow for a margin of human error during the experiment, some people react slower than others and you have to rely on the person taking the readings with the stopwatch. The results were reliable because they were almost the same in both experiments, even though there was an anomalous result; it happened in both experiments, so the results were still relibale, I have no explination for the anomalous result. ...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. Marked by a teacher

    Stereochemistry of Butenedioic acid

    5 star(s)

    Under equilibrium conditions, the thermodynamically favored product predominated. In part B of the experiment, we would react the resulted isomer in part A, i.e. fumaric acid, with molecular bromine to form 2,3-dibromosuccinic acid. The first step in the mechanism of the electrophilic addition of bromine to an alkene was the formation of a cyclic bromonium ion.

  2. Free essay

    Experiment. Is the order of reaction affected if the acid is monoprotic or diprotic?

    the amounts of reactants I will also need to control and maintain certain things unchanged so no external factors effect the rate of my reaction. Therefore, I will need to control the temperature of the reaction taking place because the reactions that I will be carrying out produce its own heat whist reacting with each other.

  1. Investigating how concentration affects rate of reaction

    Also, the temperature change needed to double the rate of reaction will vary gradually as temperature is increased. Increasing the Collision Frequency: The frequency of a collision between two molecules in a reaction is proportional to the square root of the temperature in Kelvin.(3)

  2. Investigating the rate of reaction between marble chips (calcium carbonate) and hydrochloric acid.

    This is to make sure that acid of another concentration does not interfere with an investigation. I have to keep the temperature of my surroundings, the weight of the calcium carbonate, the volume of acid and the time constant in all the experiments only changing the concentration of the acid.

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

    make a fair test but by having a constant temperature I will know that the reaction taking place amongst the acid and the metal have got the energy from the concentration of the acid and not from a foreign element.

  2. 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.

  1. Electrochemistry - Inventing Better Batteries

    Hypothesis Two (A) 1. Place two beakers side by side, filling them up half way with MgSO4 0.1M and CuSO4 0.1M. 2. Place the metals in their respective salts (sulfate solutions) 3. Connect the wires to each metal and plug the ends into the ammeter/voltmeter.

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

    Add the 2-3 drops of starch indicator to the mixture and titrate the iodine (quenched mixture) with sodium thoisulfate solution which is present at the burette. 8. Titrate it until the colour of the solution turns to colourless. 9.

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