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The aim of the investigation is to investigate how the concentration of hydrochloric acid (HCL) affects the decomposition of limestone (calcium carbonate).

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Chemistry plan Tarek Dajani Aim of Investigation: The aim of the investigation is to investigate how the concentration of hydrochloric acid (HCL) affects the decomposition of limestone (calcium carbonate). Variables that could affect the outcome of the investigation: These include: 1. Temperature 2. The amount of CaCO3 3. The state of CaCO3 e.g. Powder, granular, marble 4. The concentration of acid (HCL) 5. The amount of acid (HCL) 6. Catalyst Variable selected for the investigation is: 1. Concentration of acid (HCL) Variables that will remain constant during the investigation are: 1. Temperature 2. Amount of lime stone (CaCO3) 3. The state of lime stone (CaCO3) 4. Volume of acid (HCL) 5. No catalyst to be used Prediction: I predict that increasing the concentration of acid (HCL) will increase the rate of reaction and thus speed up the decomposition of limestone (CaCO3). My prediction is based on the assumption that with increased concentration of HCL there will be more particles of HCL to collide with CaCO3 hence producing more vigorous reaction that increases the rate of decomposition of limestone. ...read more.


For example if we have a chemical process defined in the following manner: A + B --> C According to the Rate Law: Rate = k [A]m [B]n where: k = rate constant m = rate order in respect to A n = rate order in respect to B (http://edie.cprost.sfu.ca/~rhlogan) Apparatus and Chemicals: Apparatus to be used in the experiment are: * 100m3 conical flask * Measuring cylinder * Delivery tube * Stop watch * Thermometer * Container * Pipette * Clamp Chemicals to be used in the experiment are: * Hydrochloric acid (HCL) with certain concentration as indicated on the bottle * Lime stone CaCO3 * Water Diagram of the experiment: Plan of experimental method: Procedure while conducting the experiment: Step 1: We weigh an exact amount of CaCO3 and place it in the conical flask. This weight is recorded and the same amount of CaCO3 will be used throughout the experiment. We then take a specific volume say 30 cm� (2 molar) of HCL using a pipette straight from the bottle to add it to CaCO3 in the conical flask. ...read more.


I will repeat step two a few times by decreasing the concentration level of HCL and increasing the level of H2O. In order to get more accurate and representative results we repeat the whole investigation two or three times and record fresh sets of results on new tables and take an average of the readings. This will ensure fair and accurate results Safety considerations: 1. Use goggles while conducting the experiment. 2. Keep all bags and jackets under the table. 3. Always stand up when carrying out the experiment so you can move away if in any danger. 4. Keep lab table clean and clear and just keep necessary experiment equipment Method of keeping other variables constant during the experiment: 1. The experiment will be conducted at room temperature to ensure constant temperature during the investigation. 2. Weighing the same amount of lime stone (CaCO3) 3. Using the same type of lime stone (CaCO3) 4. Using the same amount (volume) of HCL but changing its concentration Chemical Reaction: The chemical reaction that is taking place while conducting above experiment is: CaCO3 + HCL --> CaCl2 + H2O + CO2 ...read more.

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