... per a set volume than a low concentration solution. This means that they will be a higher chance of calcium carbonate molecules colliding with the hydrochloric acid molecules and reacting. According to the collision theory, reactant particles have to collide in order for the reaction to form a product in this case (calcium chloride, water and carbon dioxide). However not all collisions are successful and if there's not enough energy, the molecules will simply rebound. When the concentration is high, there are more collisions and therefore a bigger chance of collision being successful. The rate of the reaction is directly proportional to the concentration of the acid. For example, doubling the concentration of the acid will double the rate of reaction The reaction rate, however, should theoretically decrease as the reaction between HCI and CaCO3 progresses; this is because as the reaction time increases the number of HCI molecules present will decrease as they ...

See this essay or coursework document in full right now