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

To Investigate the Factors Affecting the Rate of Erosion of Buildings Made of Marble By Acid Rain.

Extracts from this document...

Introduction

Aim I am going to investigate the factors affecting the rate of erosion of buildings made of marble by acid rain. The variables affecting the rate of erosion include: * Concentration of acid-since this increases the probability of collisions between the acid molecules and the marble. I would predict that the greater the concentration the greater the probability of collisions and so the faster the rate of reaction. * Surface area-whether the marble was in chips or in fine powder form. The greater the surface area the more likely there will be collisions between the marble and the acid solution. * Temperature-the higher the temperature the greater the average kinetic energy of the molecules of the marble and the acid, so the rate of reaction will be increased because of the probability of collisions. The chemical equation for the reaction is: CaCo3(s) + 2HCl(?q) ? CaCl2(aq)+ CO2(g) + H2O(l) I have decided to investigate the relationship between concentration of acid and the rate of reaction. ...read more.

Middle

Hypothesis A greater concentration implies more acid molecules per unit volume. This gives rise to greater probability of collisions with the marble and leads to a faster chemical reaction. Results 1 Mass of Marble (g) Molarity (m/cm�) Concentration of acid (cm�) Concentration of water (cm�) Total volume (cm�) Time (s) 20 0.2 10 40 50 238.56 20 0.4 20 30 50 194.72 20 0.6 30 20 50 134.38 20 0.8 40 10 50 49.87 20 1.0 50 0 50 8.21 Results 2 Mass of Marble (g) Molarity (m/cm�) Concentration of acid (cm�) Concentration of water (cm�) Total volume (cm�) Time (s) 20 0.2 10 40 50 234.31 20 0.4 20 30 50 198.94 20 0.6 30 20 50 128.72 20 0.8 40 10 50 45.36 20 1.0 50 0 50 10.45 An average time for each concentration can now be determined: Mass of Marble (g) Molarity (m/cm�) Concentration of acid (cm�) Concentration of water (cm�) Total Volume (cm�) ...read more.

Conclusion

* The surface area of the marble chips is very difficult to make uniform, therefore in the experiment, the best control would be to ground the marble into a fine powder and compare times. This would make the surface area of the calcium carbonate (marble) as uniform as possible. * To keep the temperature the same. Although the experiment was conducted in the laboratory, at room temperature, this could make it an unfair test as the temperature may fluctuate. To perform the experiment in a fume cupboard, with a thermostat control would be more advisable. * To record the volume of gas liberated every 10 seconds until each experiment continued to completion. e.g. volume completion time Conclusion The greater the concentration of acid the shorter the time to fill the gas cylinder. This implies that the greater the concentration of acid the faster the reaction. However, the relationship between concentration of acid and rate of reaction does not appear to be a linear relationship because for higher concentrations the length of time for the experiment to be completed becomes progressively shorter. 1 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 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. To investigate the rate of reaction between different concentrations of hydrochloric acid with metal ...

    Answer 1. To offset the balance of not very accurate results, this experiment can be done very quickly, therefore can be repeated a number of times, so that an average can be gotten, and so from this experiment a reasonably accurate result can be got.

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

    present in 100 grams of Spinach. This is not the expected result of 4 mg's, which is what the many textbooks suggest the answer should be. The reason this experiment suggests there is such a low concentration of iron (II)

  1. The effect of Acid Rain on Seed Germination.

    0 0 0 0 0 0 0 0 0 0 0 0.29 0 0.29 60 2.0 0 1.4 0 1.6 0 1.0 0 2.1 0 0 0 0 0 0 0 0 0 0 0 0.81 0 0.81 50 1.3 0 1.9 0 1.1 0 2.2 0 1.7 0 0

  2. The Factors Affecting the Volume of CO2 released when a Carbonate reacts with an ...

    Choosing the Acid Before performing the preliminary I have predicted that all the acids will release approximately the same volume of CO2 providing the acid's concentration remains constant. Acid Concentration/M Carbonate Mass/g CO2 Released/cm3 Hydrochloric 1 Calcium Carbonate 0.5 106 Sulphuric 1 Calcium Carbonate 0.5 88 Nitric 1 Calcium Carbonate

  1. Acid Rain

    The sulphur dioxide and nitrogen oxides can be transformed into sulphuric acid and nitric acid, air currents can send them thousands of kilometres from the source. When the acids fall to the earth in any form it will have large impact on the growth or the preservation of certain wildlife.

  2. An investigation into the factors affecting the rate of reaction of indigestions tablets with ...

    different ratios of acid to water to vary the concentration, different quantities of acid were measured into the beakers using a measuring cylinder. This was then mixed to a certain quantity of water to produce 50 cm3 of the acid (5 beakers in different concentrations).

  1. How does Acid Rain Affect Buildings.

    NO2, SO2). The gases released form 2 kinds of acid rain: H2SO4 and HNO3. Here are some equations to show how the acid rain is formed in the atmosphere: To form H2SO4 we need SO3 but in the industry and in automobiles the sulphur oxides are in the form of SO2.

  2. The Erosion of Marble

    My independent variable will be the concentration of acid. To change the concentration of hydrochloric acid I will used a total of 40 cm3 of hydrochloric acid/water solution. To vary the concentration of acid I will use 40 cm3 of acid and 0 cm3 of water, then I will use

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