Planning I have decided to investigate the effect of different concentrations of hydrochloric acid on marble chips. I want to see how long it takes for 30cm of carbon dioxide to be given off once the acid and marble chips start reacting. ... In this investigation I will be using the following apparatus, one conical flask to put the marble chips in and also to put the acid in so they react. ... One balance to measure the weight of the marble chips. ... This makes collisions between the reactant particles more likely. ... Firstly the mass of the chips was kept as similar as possible, I did this by weighing the chips to be at an approximate mass of 1. ... From a previous experiment I did involving different sized marble chips I found that the surface area greatly effects the rate of reaction, therefore I tried to find marble chips of roughly the same size. Another variable I took into account was the volume of HCl I will use; I am changing the amounts of acid in each concentration. ... I decided to use different concentrations of HCl in my experiment, these are them-: 50cm3 acid- 0cm3 water, 40cm3 acid- 10cm3 water, 30cm3 acid- 20cm3 water, 20cm3 acid- 30cm3 water, 10cm3 acid- 40cm3 water. ... I think that this happened because the more HCl in the solution the greater the concentration and there will be more particles colliding and more energy and therefore a faster rate of reaction. ... Therefore I predict that the rate of reaction will increase with the concentration of the HCl solutions. ... At this point we are able to answer our main hypothesis which was æhow does changing the concentration of acid affect the rate of reaction between hydrochloric acid and calcium carbonate. ... This makes collisions between the reactant particles more likely. ... I used roughly the same weight and three chips of roughly the same size throughout the whole experiment, this kept the surface area constant, but something unexpected happened.
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