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How the Concentration of Hydrochloric acid Affects the Rate of Co2 produced by Marble chips

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Planning: How the Concentration of Hydrochloric acid Affects the Rate of Co2 produced by Marble chips Introduction: From this experiment I hope to succeed in finding the answer to the to the question: How does the amount of concentration of hydrochloric acid affect the amount of carbon dioxide given off by the reaction of calcium carbonate (marble chips) and the acid. I know that the following reaction takes place when the acid and chips are united: Hydrochloric acid + calcium carbonate ? Calcium chloride + water + Carbon dioxide This is how I know Carbon dioxide is produced but how much with different concentrations of acid is the question. Diagram: Variables: Input variable: Concentration of hydrochloric acid Output variable: Amount of Carbon dioxide produced Constant variables: Temperature (room) Mass of marble chips Volume of acid/water (50cm3) ...read more.


The five different concentrations I will be using for this experiment will be: Cm3 of hydrochloric acid (2mol/l) Cm3 of water 50 0 40 10 30 20 20 20 10 40 Risk Assessments: Before starting the experiment one should put on safety goggles and a lab coat to prevent the hydrochloric acid from damaging our eyes or clothes. As the acid is highly corrosive it should be handled with great care to avoid external or internal damage. If there is any split I will wipe it up straight away. To avert mistakes I will always label the beaker with the acid in it. The calcium carbonate (CaCo3) or marble in powder form is also dangerous and when it reacts with hydrochloric acid may spurt out and damage my eyes, this is the reason I wear eye protection. ...read more.


Prediction: I predict that the rate of reaction will increase as the concentration increases. This means that the amount of carbon dioxide is produced at a greater rate. See below for the graphs of 'gas collected against concentration' and 'rate of reaction against concentration': Gas Rate of Collected Reaction Concentration Concentration I believe that the gas collected will be proportionate to the concentration because as the concentration weakens, the gas collected decreases too as there is less acid to corrode the marble chips (which produce the Co2.) The other graph rate of reaction against the concentration) represents the same because a smaller concentration will mean a slower rate of reaction and vise versa. This is why the two are proportionate. Basically the two are stating that the higher the concentration the faster the rate of reaction because there is more acid to react with the calcium chloride so the more Co2 is produced as the calcium chloride gives this off. Hugo Jones Chemistry coursework ...read more.

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