Experiment is to investigate the rate of reaction between hydrochloric acid and calcium carbonate :: GCSE Chemistry Coursework Investigation

Experiment is to investigate the gait of reception between hydrochloric sulphurous and atomic number 20 carbonateHydrochloric acid + Calcium Carbonate Calcium Chloride + pee +Carbon Dioxide2HCl (aq) CaCo3 (s) CaCl2(s) H2O (aq) CO2 (g)There atomic number 18 a estimate of variables in this experiment and these arelisted below as input variables and upshot variables. The inputvariables are the ones that I bunghole change in ordinance to affect theexperiment and the publication variables are the ones I will cadency tosee how the input variable has affected it.Input Variables---------------Amount of calcium carbonateAmount of hydrochloric acidSurface area of calcium carbonateConcentration of hydrochloric acidTemperature of hydrochloric acidIntroduction of a catalyst resultant role variables-----------------Amount of calcium chloride releasedAmount of water releasedAmount of carbon dioxide released limiting in weightOut of these variables I will use parsimony as my input vari ableand amount of carbon dioxide released as my outcome variable. You cansee how I will use and measure these variables in the method sectionof this investigation.My preliminary results can be found in appendix 1. These show whatmeasurements of the input variables I decided to use and why I decidedthis.Prediction==========I predict that as the submersion of the hydrochloric acid decreasesthe rate of reaction will decrease and therefore the clipping taken for75ml of gas to be released will enlarge. The reason I opine this isthat chemical reactions occur when particles of the reactingsubstances collide. Increasing the number of the particles increasesthe number of collisions per hour and this increases the reactionrate.In the reaction between hydrochloric acid and calcium carbonate youcan increase the number of particles in two ways. The first of theseis to increase the find area of the calcium carbonate. Althoughthis does not directly increase the number of particles, it doesin crease the number of particles that are available for the H+ ions toreact with. This is shown in diagram 1 of appendix 2.The second way to increase the concentration in my experiment is toincrease the concentration of the hydrochloric acid. By doing this youincrease the number of H+ ions available to react with the calciumcarbonate and therefore the number of collisions per second betweenthe two increase. If the number of collisions per second increasesthen the reaction rate will increase. This is demonstrated in diagram2 of appendix 2.In order to gain perfect results I would have to use the nextweights of each component of the formula and introduce nothing elseinto the equation. All of the weights are in gramsCaCO3 + 2HCl CaCl2 + H2O + CO2