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An investigation to see how marble chips react with acid.

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An investigation to see how marble chips react with acid. In the stomach, if there is too much acid it causes indigestion. One ingredient that can be used against it is calcium carbonate, which neutralises the excess hydrochloric acid. This investigation is to see the neutralisation of stomach acid by marble chips. Hydrochloric + calcium carbonate Calcium chloride + water + carbon dioxide Aim: To investigate one factor that affects the rate of reaction between marble chips and hydrochloric acid. Apparatus 2g marble chips 50 ml hydrochloric acid Conical flask Delivery tube Gas syringe Safety goggles Stopwatch Beaker Safety As we will be handling with acid, we are going to wear safety goggles during the experiment. ...read more.


Diagram Method: The apparatus is set up as shown in the diagram. I accurately measure out 2.00g of marble chips and place them into a conical flask; the chips will need to be of a similar size to make this a fair test. Then I will need to add 50ml of hydrochloric acid to each of the experiments performed to make this fair, using a measuring cylinder to be accurate. We have chosen to use acid, as it will be similar to the acid contained in our stomachs. The solute and solvent are mixed together to form a solution. I will then need to observe the gas syringe every 10 seconds to record the amount of gas given off from the marbles. ...read more.


Evaluation: I believe that my results were almost as accurate as I could get them, and managed to see that the prediction and the conclusion matched. However, there are several things that I would want to change. If I had the chance to perform the experiment in the same lesson the results would have been further accurate. There are no anomalies, but it would further help if those experiments were carried out so that the results could be more similar than those I have as some are not very consistent. Apart from that, my experiment went very well To improve the entire experiment, I would make sure that all the tests were carried out during one lesson, as it would ensure that the chemicals and limestones were identical. It may have been that the results being slightly inconsistent came from using a slightly different acid or limestone. ...read more.

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