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An Investigation Into The Factors Affecting The Corrosion Of Limestone By Acid

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Introduction

An Investigation Into The Factors Affecting The Corrosion Of Limestone By Acid Introduction I am going to do an investigation into the factors affecting corrosion of Limestone. The factors, which you could change, are: - * Temperature * Mass * Concentration of acid * Surface area * And catalysts The speed or rate of a chemical reaction is: - * How fast the products are being made * How fast the reactants are being used up It increases when: - The Temperature Increases This is because at low temperatures, particles of reacting substances do not have much energy. However, when the substances are heated, the particles take in energy. This causes them to move faster, and so collide more often (which has to occur, for the reaction to take place) the collisions have more energy (an activation energy) so more are successful. So the rate of reaction increases. Surface area and mass The greater the surface area, and the smaller the mass, the more chance of collisions occurring. ...read more.

Middle

a) Chemical reactions happen when particles of the reactants collide with each other. b) They must collide with a minimum energy, called the "activation energy". Apparatus Distilled Water Acid (various concentrations) Limestone Conical Flask Stop clock Cotton wool Scales Measuring cylinder Fair Test The same value of limestone (6g) will always be used. The only thing to change is the Acid concentration Method > Put goggles on for safety > Measure dilution of acid needed. 100% is 60ml pure acid. 75% is 45ml acid (15ml distilled water) 50% is 30ml acid (30ml distilled water) 25% is 15ml acid (45ml distilled water) 10% is 6ml acid (54ml distilled water) > Weigh out 6g of limestone on the scales > Pore the dilution used into a conical flask > Put the conical flask on the scales with cotton wool in the top then zero the scales > Take the cotton wool out of the flask and get ready to press start on the stop clock > Put limestone in the conical flask, press start, ...read more.

Conclusion

For example, for 100% the average total mass lost was 0.7g For 10% a total of 0.3g of mass was lost. This is because there are more acid molecules in 100% concentration and in 10% concentration there are less. The reason this is is because the particles are closer together, hit each other more often, and so will react quicker. Evaluation There is no clear difference in the numbers, as they were all as accurate as I could get them. For this reason it was a very accurate test, although the results were all rounded off to one decimal place, more attempts should have been made to obtain evidence (to make averages more accurate.) The limestone was not the same size each time and the room was not the same temperature. These factors we could not control, would have affected the results considerably. Future tests could be made with more percentages, using the same methods but using closer percentages such as 5% intervals or with much higher percentages, such as 100% 4M acid. ...read more.

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