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# Find out what changes the speed of the reaction between marble chips and acid.

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Introduction

The aim of this experiment is to find out what changes the speed of the reaction between marble chips and acid. In this experiment, there are several variables that could be changed or kept the same. The list of variables is: * Volume of acid * Temperature of acid * Size of the marble chips * Mass * Concentration of acid to water. Out of these five possible variables, I will be changing the concentration of acid to water. I will keep the other four variables the same. The total volume of solution will be 50cm3 for each experiment. The temperature of the acid and water will both be at room temperature. The size of the marble chips will be small for each and every experiment. My prediction is that the marble chips will react faster if there is more acid and less water. Therefore if there is a higher amount of water in the solution, then the reaction will go slower. I think this will happen because of the collision theory. The collision theory says that particles will react if they collide with enough energy. ...read more.

Middle

List of equipment: * Weighing scales * 50g Small marble chips * Hydrochloric Acid * Water * Measuring cylinder * Beaker * 100cm3 Conical flask * Delivery tube * Stopwatch * Test tube * Trough Method: 1. Set up the experiment as shown before 2. Weigh the marble chips, it should be 5grams for each experiment 3. Mix the right ration of acid to water in a separate beaker 4. Mark on the test tube where 50cm3 is 5. Pour the solution and marble chips into a conical flask and put the cork with the delivery tube coming off of it onto the mouth of the conical flask 6. Start the stopwatch 7. Watch to see when the gas fills the tube forcing the water to go below the line on the test tube 8. Stop the stopwatch 9. Record the results 10. Repeat the whole experiment 4 other times, but changing the ratio in the solution for each time. On the following page, you will find our preliminary results. Concentration Time taken 30cm3 of acid, 20cm3 of 56.75 Water. 35cm3 of acid, 15cm3 of 14.54 Water. ...read more.

Conclusion

My prediction was correct in saying the higher the amount of acid in the solution, the shorter time it will take to produce a certain amount of carbon dioxide. To compare my experiment with other people's results show that our results are very similar. From the graph we can see that it has a resemblance to my prediction graph, this means that my prediction was correct. Evaluation I think that the experiment went very well. I made sure all the things that will keep the experiments fair were in place. To improve the experiment I could have the sample bigger, by doing more experiments and by having more varied solutions. The bigger the sample, then the more accurate the results will be. On the graph there are a few anomalous results. Particularly for the 35 and the 40cm3 of acid experiments. I don't know why the results came up as they did on the graph. For these two experiments, I did nothing different, so there is no explanation for the anomalous results to have occurred. ...read more.

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